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.

1 files changed, 0 insertions, 18 deletions

diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 487ca2b009..bb379ff4af 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -701,15 +701,6 @@ void Viewport::set_canvas_transform(const Transform2D &p_transform) {
 
 	canvas_transform = p_transform;
 	VisualServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform);
-
-	Transform2D xform = (global_canvas_transform * canvas_transform).affine_inverse();
-	Size2 ss = get_visible_rect().size;
-	/*SpatialSound2DServer::get_singleton()->listener_set_transform(internal_listener_2d, Transform2D(0, xform.xform(ss*0.5)));
-	Vector2 ss2 = ss*xform.get_scale();
-	float panrange = MAX(ss2.x,ss2.y);
-
-	SpatialSound2DServer::get_singleton()->listener_set_param(internal_listener_2d, SpatialSound2DServer::LISTENER_PARAM_PAN_RANGE, panrange);
-*/
 }
 
 Transform2D Viewport::get_canvas_transform() const {
@@ -722,15 +713,6 @@ void Viewport::_update_global_transform() {
 	Transform2D sxform = stretch_transform * global_canvas_transform;
 
 	VisualServer::get_singleton()->viewport_set_global_canvas_transform(viewport, sxform);
-
-	Transform2D xform = (sxform * canvas_transform).affine_inverse();
-	Size2 ss = get_visible_rect().size;
-	/*SpatialSound2DServer::get_singleton()->listener_set_transform(internal_listener_2d, Transform2D(0, xform.xform(ss*0.5)));
-	Vector2 ss2 = ss*xform.get_scale();
-	float panrange = MAX(ss2.x,ss2.y);
-
-	SpatialSound2DServer::get_singleton()->listener_set_param(internal_listener_2d, SpatialSound2DServer::LISTENER_PARAM_PAN_RANGE, panrange);
-*/
 }
 
 void Viewport::set_global_canvas_transform(const Transform2D &p_transform) {