Squashed 'external/stb/stb/' changes from c39c7023eb..f4a71b1337

f4a71b1337 README.md: tweak credits
a8a25e17b5 update readme version numbers
0bc88af4de stb_image: optimizations
0ca75da4ec stb_image_resize2: remove whitespace
9d924f8a47 stb_image_resize: 2.04
4da08a1dbd stb_image: create_png_image_raw restructuring
c6d7c32e5d stb_image: Two warning fixes
07268cbf36 stb_image: New Paeth filter
ed64333410 tests: test_png_regress
45eb4ac158 global: very basic .gitignore for object files
e5f0e18d0f stb_image: Small PNG filter simplification
d373674115 stb_image: Fix zlib decoder end-of-stream handling
03f50e343d security notice
1d878bd2a3 security notice
beebb24b94 README.md: fix reference to stb_image_resize2.h
e81f294b16 stb_image_resize: switch GNU/clang from "asm" to "__asm__" for -c99 compatibility
c4bbb6e75f stb_image_resize2.h 2.00
REVERT: c39c7023eb stb_image: create_png_image_raw restructuring
REVERT: 8c3aa05487 stb_image: Two warning fixes
REVERT: 3aa1744a29 stb_image: New Paeth filter
REVERT: 2f3b7e47fa tests: test_png_regress
REVERT: d647af9ad2 global: very basic .gitignore for object files
REVERT: 5a44133dc5 stb_image: Small PNG filter simplification
REVERT: 9f1776a36d stb_image: Fix zlib decoder end-of-stream handling

git-subtree-dir: external/stb/stb
git-subtree-split: f4a71b13373436a2866c5d68f8f80ac6f0bc1ffe

tests/test_c_compilation.c

@@ -1,3 +1,6 @@
+#define STB_IMAGE_RESIZE_IMPLEMENTATION
+#include "stb_image_resize2.h"
+
 #define STB_SPRINTF_IMPLEMENTATION
 #include "stb_sprintf.h"
 
@@ -7,7 +10,6 @@
 #define STB_DIVIDE_IMPLEMENTATION
 #define STB_IMAGE_IMPLEMENTATION
 #define STB_HERRINGBONE_WANG_TILE_IMEPLEMENTATIOn
-#define STB_IMAGE_RESIZE_IMPLEMENTATION
 #define STB_RECT_PACK_IMPLEMENTATION
 #define STB_VOXEL_RENDER_IMPLEMENTATION
 #define STB_EASY_FONT_IMPLEMENTATION
@@ -20,7 +22,6 @@
 #include "stb_perlin.h"
 #include "stb_c_lexer.h"
 #include "stb_divide.h"
-#include "stb_image_resize.h"
 #include "stb_rect_pack.h"
 #include "stb_dxt.h"
 #include "stb_include.h"