Fix warnings about set but unused variables [-Wunused-but-set-variable]

Fixes the following GCC 5 warnings:
```
drivers/gles2/rasterizer_canvas_gles2.cpp:814:8: warning: variable 'rt_size' set but not used [-Wunused-but-set-variable]
drivers/gles2/rasterizer_scene_gles2.cpp:2270:11: warning: variable 'vp_height' set but not used [-Wunused-but-set-variable]
drivers/gles2/rasterizer_scene_gles2.cpp:2673:22: warning: variable 'e' set but not used [-Wunused-but-set-variable]
drivers/gles2/rasterizer_scene_gles2.cpp:715:7: warning: variable 'no_cull' set but not used [-Wunused-but-set-variable]
drivers/gles2/shader_gles2.cpp:693:14: warning: variable 'cc' set but not used [-Wunused-but-set-variable]
drivers/gles3/rasterizer_canvas_gles3.cpp:1226:8: warning: variable 'rt_size' set but not used [-Wunused-but-set-variable]
drivers/gles3/rasterizer_scene_gles3.cpp:3039:10: warning: variable 'contrib' set but not used [-Wunused-but-set-variable]
drivers/gles3/rasterizer_scene_gles3.cpp:4504:32: warning: variable 'vp_height' set but not used [-Wunused-but-set-variable]
editor/editor_inspector.cpp:272:9: warning: variable 'guide_color' set but not used [-Wunused-but-set-variable]
editor/editor_themes.cpp:1067:14: warning: variable 'alpha3' set but not used [-Wunused-but-set-variable]
editor/editor_themes.cpp:263:8: warning: variable 'script_bg_color' set but not used [-Wunused-but-set-variable]
editor/plugins/collision_shape_2d_editor_plugin.cpp:326:11: warning: variable 'cpoint' set but not used [-Wunused-but-set-variable]
editor/plugins/mesh_editor_plugin.cpp:72:9: warning: variable 'size' set but not used [-Wunused-but-set-variable]
editor/plugins/shader_editor_plugin.cpp:471:12: warning: variable 'mpos' set but not used [-Wunused-but-set-variable]
editor/plugins/shader_editor_plugin.cpp:89:8: warning: variable 'basetype_color' set but not used [-Wunused-but-set-variable]
editor/plugins/shader_editor_plugin.cpp:90:8: warning: variable 'type_color' set but not used [-Wunused-but-set-variable]
editor/plugins/shader_editor_plugin.cpp:92:8: warning: variable 'string_color' set but not used [-Wunused-but-set-variable]
modules/visual_script/visual_script_editor.cpp:2521:7: warning: variable 'seq_connect' set but not used [-Wunused-but-set-variable]
platform/android/export/export.cpp:580:12: warning: variable 'styles_count' set but not used [-Wunused-but-set-variable]
platform/android/export/export.cpp:584:12: warning: variable 'styles_offset' set but not used [-Wunused-but-set-variable]
platform/osx/export/export.cpp:464:9: warning: variable 'zerr' set but not used [-Wunused-but-set-variable]
scene/2d/tile_map.cpp:260:10: warning: variable 'tcenter' set but not used [-Wunused-but-set-variable]
scene/3d/light.cpp:166:7: warning: variable 'editor_ok' set but not used [-Wunused-but-set-variable]
scene/3d/navigation.cpp:566:11: warning: variable 'closest_navmesh' set but not used [-Wunused-but-set-variable]
scene/gui/rich_text_label.cpp:869:8: warning: variable 'size' set but not used [-Wunused-but-set-variable]
scene/main/viewport.cpp:705:14: warning: variable 'xform' set but not used [-Wunused-but-set-variable]
scene/main/viewport.cpp:706:8: warning: variable 'ss' set but not used [-Wunused-but-set-variable]
scene/main/viewport.cpp:726:14: warning: variable 'xform' set but not used [-Wunused-but-set-variable]
scene/main/viewport.cpp:727:8: warning: variable 'ss' set but not used [-Wunused-but-set-variable]
scene/resources/material.cpp:430:7: warning: variable 'using_world' set but not used [-Wunused-but-set-variable]
servers/visual/shader_language.cpp:2026:7: warning: variable 'all_const' set but not used [-Wunused-but-set-variable]
servers/visual/visual_server_scene.cpp:1383:28: warning: variable 'z_max_cam' set but not used [-Wunused-but-set-variable]
```

Also fixes two [-Wunused-value] warnings:
```
scene/gui/text_edit.cpp:4405:20: warning: statement has no effect [-Wunused-value]
servers/visual/visual_server_scene.cpp:905:48: warning: value computed is not used [-Wunused-value]
```

Some of those are bugs and need further work, they are identified with
`// FIXME` comments.

5 files changed, 4 insertions, 26 deletions

diff --git a/drivers/gles2/rasterizer_canvas_gles2.cpp b/drivers/gles2/rasterizer_canvas_gles2.cpp
index 4ae4441462..263f210fa2 100644
--- a/drivers/gles2/rasterizer_canvas_gles2.cpp
+++ b/drivers/gles2/rasterizer_canvas_gles2.cpp
@@ -811,8 +811,6 @@ void RasterizerCanvasGLES2::canvas_render_items(Item *p_item_list, int p_z, cons
 
 	bool rebind_shader = true;
 
-	Size2 rt_size = Size2(storage->frame.current_rt->width, storage->frame.current_rt->height);
-
 	state.current_tex = RID();
 	state.current_tex_ptr = NULL;
 	state.current_normal = RID();
diff --git a/drivers/gles2/rasterizer_scene_gles2.cpp b/drivers/gles2/rasterizer_scene_gles2.cpp
index 2007d11b98..9d78c4c097 100644
--- a/drivers/gles2/rasterizer_scene_gles2.cpp
+++ b/drivers/gles2/rasterizer_scene_gles2.cpp
@@ -712,10 +712,8 @@ void RasterizerSceneGLES2::_add_geometry_with_material(RasterizerStorageGLES2::G
 	bool has_alpha = has_base_alpha || has_blend_alpha;
 
 	bool mirror = p_instance->mirror;
-	bool no_cull = false;
 
 	if (p_material->shader->spatial.cull_mode == RasterizerStorageGLES2::Shader::Spatial::CULL_MODE_DISABLED) {
-		no_cull = true;
 		mirror = false;
 	} else if (p_material->shader->spatial.cull_mode == RasterizerStorageGLES2::Shader::Spatial::CULL_MODE_FRONT) {
 		mirror = !mirror;
@@ -738,7 +736,6 @@ void RasterizerSceneGLES2::_add_geometry_with_material(RasterizerStorageGLES2::G
 			//shader does not use discard and does not write a vertex position, use generic material
 			if (p_instance->cast_shadows == VS::SHADOW_CASTING_SETTING_DOUBLE_SIDED) {
 				p_material = storage->material_owner.getptr(!p_shadow_pass && p_material->shader->spatial.uses_world_coordinates ? default_worldcoord_material_twosided : default_material_twosided);
-				no_cull = true;
 				mirror = false;
 			} else {
 				p_material = storage->material_owner.getptr(!p_shadow_pass && p_material->shader->spatial.uses_world_coordinates ? default_worldcoord_material : default_material);
@@ -2264,7 +2261,6 @@ void RasterizerSceneGLES2::render_shadow(RID p_light, RID p_shadow_atlas, int p_
 	uint32_t y;
 	uint32_t width;
 	uint32_t height;
-	uint32_t vp_height;
 
 	float zfar = 0;
 	bool flip_facing = false;
@@ -2350,14 +2346,12 @@ void RasterizerSceneGLES2::render_shadow(RID p_light, RID p_shadow_atlas, int p_
 		normal_bias = light->param[VS::LIGHT_PARAM_SHADOW_NORMAL_BIAS] * bias_mult;
 
 		fbo = directional_shadow.fbo;
-		vp_height = directional_shadow.size;
 	} else {
 		ShadowAtlas *shadow_atlas = shadow_atlas_owner.getornull(p_shadow_atlas);
 		ERR_FAIL_COND(!shadow_atlas);
 		ERR_FAIL_COND(!shadow_atlas->shadow_owners.has(p_light));
 
 		fbo = shadow_atlas->fbo;
-		vp_height = shadow_atlas->size;
 
 		uint32_t key = shadow_atlas->shadow_owners[p_light];
 
@@ -2666,10 +2660,6 @@ void RasterizerSceneGLES2::initialize() {
 	}
 
 	shadow_filter_mode = SHADOW_FILTER_NEAREST;
-
-	RenderList::Element e;
-	e.sort_key = 0;
-	e.light_type1 = 1;
 }
 
 void RasterizerSceneGLES2::iteration() {
diff --git a/drivers/gles2/shader_gles2.cpp b/drivers/gles2/shader_gles2.cpp
index 5f4a3fd01c..628a57c06d 100644
--- a/drivers/gles2/shader_gles2.cpp
+++ b/drivers/gles2/shader_gles2.cpp
@@ -690,11 +690,6 @@ void ShaderGLES2::use_material(void *p_material) {
 
 	Version *v = version_map.getptr(conditional_version);
 
-	CustomCode *cc = NULL;
-	if (v) {
-		cc = custom_code_map.getptr(v->code_version);
-	}
-
 	// bind uniforms
 	for (Map<StringName, ShaderLanguage::ShaderNode::Uniform>::Element *E = material->shader->uniforms.front(); E; E = E->next()) {
 
@@ -992,8 +987,6 @@ void ShaderGLES2::use_material(void *p_material) {
 			}
 		}
 
-		// GLint location = get_uniform_location(E->key());
-
 		GLint location;
 		if (v->custom_uniform_locations.has(E->key())) {
 			location = v->custom_uniform_locations[E->key()];
diff --git a/drivers/gles3/rasterizer_canvas_gles3.cpp b/drivers/gles3/rasterizer_canvas_gles3.cpp
index c9bdc6f5c3..856c83e297 100644
--- a/drivers/gles3/rasterizer_canvas_gles3.cpp
+++ b/drivers/gles3/rasterizer_canvas_gles3.cpp
@@ -1223,8 +1223,6 @@ void RasterizerCanvasGLES3::canvas_render_items(Item *p_item_list, int p_z, cons
 
 	bool rebind_shader = true;
 
-	Size2 rt_size = Size2(storage->frame.current_rt->width, storage->frame.current_rt->height);
-
 	state.canvas_shader.set_conditional(CanvasShaderGLES3::USE_DISTANCE_FIELD, false);
 
 	glBindBuffer(GL_UNIFORM_BUFFER, state.canvas_item_ubo);
diff --git a/drivers/gles3/rasterizer_scene_gles3.cpp b/drivers/gles3/rasterizer_scene_gles3.cpp
index 086829f9ba..e74fe113c0 100644
--- a/drivers/gles3/rasterizer_scene_gles3.cpp
+++ b/drivers/gles3/rasterizer_scene_gles3.cpp
@@ -3036,13 +3036,14 @@ void RasterizerSceneGLES3::_setup_reflections(RID *p_reflection_probe_cull_resul
 			reflection_ubo.ambient[3] = rpi->probe_ptr->interior_ambient_probe_contrib;
 		} else {
 			Color ambient_linear;
-			float contrib = 0;
+			// FIXME: contrib was retrieved but never used, is it meant to be set as ambient[3]? (GH-20361)
+			//float contrib = 0;
 			if (p_env) {
 				ambient_linear = p_env->ambient_color.to_linear();
 				ambient_linear.r *= p_env->ambient_energy;
 				ambient_linear.g *= p_env->ambient_energy;
 				ambient_linear.b *= p_env->ambient_energy;
-				contrib = p_env->ambient_sky_contribution;
+				//contrib = p_env->ambient_sky_contribution;
 			}
 
 			reflection_ubo.ambient[0] = ambient_linear.r;
@@ -4501,7 +4502,7 @@ void RasterizerSceneGLES3::render_shadow(RID p_light, RID p_shadow_atlas, int p_
 	RasterizerStorageGLES3::Light *light = storage->light_owner.getornull(light_instance->light);
 	ERR_FAIL_COND(!light);
 
-	uint32_t x, y, width, height, vp_height;
+	uint32_t x, y, width, height;
 
 	float dp_direction = 0.0;
 	float zfar = 0;
@@ -4583,7 +4584,6 @@ void RasterizerSceneGLES3::render_shadow(RID p_light, RID p_shadow_atlas, int p_
 		bias = light->param[VS::LIGHT_PARAM_SHADOW_BIAS] * bias_mult;
 		normal_bias = light->param[VS::LIGHT_PARAM_SHADOW_NORMAL_BIAS] * bias_mult;
 		fbo = directional_shadow.fbo;
-		vp_height = directional_shadow.size;
 
 	} else {
 		//set from shadow atlas
@@ -4593,7 +4593,6 @@ void RasterizerSceneGLES3::render_shadow(RID p_light, RID p_shadow_atlas, int p_
 		ERR_FAIL_COND(!shadow_atlas->shadow_owners.has(p_light));
 
 		fbo = shadow_atlas->fbo;
-		vp_height = shadow_atlas->size;
 
 		uint32_t key = shadow_atlas->shadow_owners[p_light];