Add `etcpak` library for faster ETC/ETC2/S3TC imports.

- `etc` module was renamed to `etcpak` and modified to use the new library.
- PKM importer is removed in the process, it's obsolete.
- Old library `etc2comp` is removed.
- S3TC compression no longer done via `squish` (but decompression still is).
- Slight modifications to etcpak sources for MinGW compatibility,
  to fix LLVM `-Wc++11-narrowing` errors, and to allow using vendored or
  system libpng.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

1 files changed, 0 insertions, 67 deletions

diff --git a/thirdparty/etc2comp/EtcConfig.h b/thirdparty/etc2comp/EtcConfig.h
deleted file mode 100644
index 3bfe1d99a8..0000000000
--- a/thirdparty/etc2comp/EtcConfig.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright 2015 The Etc2Comp Authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#ifdef _WIN32
-#define ETC_WINDOWS (1)
-#else
-#define ETC_WINDOWS (0)
-#endif
-
-#if __APPLE__
-#define ETC_OSX (1)
-#else
-#define ETC_OSX (0)
-#endif
-
-#if __unix__
-#define ETC_UNIX (1)
-#else
-#define ETC_UNIX (0)
-#endif
-
-
-// short names for common types
-#include <stdint.h>
-typedef int8_t i8;
-typedef int16_t i16;
-typedef int32_t i32;
-typedef int64_t i64;
-
-typedef uint8_t u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef uint64_t u64;
-
-typedef float	f32;
-typedef double	f64;
-
-// Keep asserts enabled in release builds during development
-#undef NDEBUG
-
-// 0=disable. stb_image can be used if you need to compress
-//other image formats like jpg
-#define USE_STB_IMAGE_LOAD 0
-
-#if ETC_WINDOWS
-#include <sdkddkver.h>
-#define _CRT_SECURE_NO_WARNINGS (1)
-#include <tchar.h>
-#endif
-
-#include <stdio.h>
-