Adds a patch to automatically apply the macOS fix to glad after its generation.

source/third_party/glad/README.md

@@ -17,6 +17,8 @@ pip install -r requirements.txt
 
 Do not revert the WFG patch in include/glad/gl.h (around line 1765):
 do not add the change reverting it after the generation of the file
+Currently it's automatically applied by running the update-headers script.
+On Windows you need to run it under Git Bash or with the `patch` program in PATH.
 
 Build the source files for all four backends with their respective extensions
 - GL

source/third_party/glad/fix_macos.patch

@@ -0,0 +1,17 @@
+diff --git b/include/glad/gl.h a/include/glad/gl.h
+index 0a8db581a6..4c7c3564c3 100644
+--- b/include/glad/gl.h
++++ a/include/glad/gl.h
+@@ -1763,7 +1763,11 @@ typedef void *GLeglImageOES;
+ typedef char GLchar;
+ typedef char GLcharARB;
+ #ifdef __APPLE__
+-typedef void *GLhandleARB;
++// --- Patched by WFG
++// See https://bugs.freedesktop.org/show_bug.cgi?id=66346
++// macOS considers those to be different.
++// typedef void *GLhandleARB;
++typedef GLuint GLhandleARB;
+ #else
+ typedef unsigned int GLhandleARB;
+ #endif

source/third_party/glad/update-headers.cmd

@@ -6,6 +6,7 @@ python -m glad --api="glx=1.4" --extensions="../extensions/glx.txt" --out-path="
 python -m glad --api="wgl=1.0" --extensions="../extensions/wgl.txt" --out-path="../" c
 python -m glad --api="vulkan=1.1" --extensions="../extensions/vulkan.txt" --out-path="../" c
 cd ..
+patch -p1 --ignore-whitespace --fuzz 1 < fix_macos.patch
 MOVE src\gl.c src\gl.cpp
 MOVE src\gles2.c src\gles2.cpp
 MOVE src\glx.c src\glx.cpp

source/third_party/glad/update-headers.sh

@@ -8,6 +8,7 @@
 	python -m glad --api="egl=1.5" --extensions="../extensions/egl.txt" --out-path="../" c
 	python -m glad --api="vulkan=1.1" --extensions="../extensions/vulkan.txt" --out-path="../" c
 )
+patch -p1 --ignore-whitespace --fuzz 1 <fix_macos.patch
 mv src/gl.c src/gl.cpp
 mv src/gles2.c src/gles2.cpp
 mv src/glx.c src/glx.cpp