external: avoid conflicts of our GL headers with GLES3/gl32.h.

doc/changelog.dox

@@ -86,6 +86,8 @@ See also:
 
 -   Fixed compilation of the @ref GL library on macOS with ANGLE --- new code
     assumed macOS is always desktop GL (see [mosra/magnum#452](https://github.com/mosra/magnum/issues/452))
+-   Avoiding conflicts of Magnum's own GL headers with `GLES3/gl32.h` (see
+    [mosra/magnum#460](https://github.com/mosra/magnum/issues/460))
 
 @subsection changelog-latest-bugfixes Bug fixes
 

src/MagnumExternal/OpenGL/GLES3/Emscripten/flextGLEmscripten.h.template

@@ -45,6 +45,7 @@
 #define __gl2_h_
 #define __gl3_h_
 #define __gl31_h_
+#define __gl32_h_
 #define __gl2ext_h_
 #define __gl3ext_h_
 #define __gl2platform_h_

src/MagnumExternal/OpenGL/GLES3/flextGL.h

@@ -47,6 +47,7 @@
 #define __gl2_h_
 #define __gl3_h_
 #define __gl31_h_
+#define __gl32_h_
 #define __gl2ext_h_
 #define __gl3ext_h_
 #define __gl2platform_h_

src/MagnumExternal/OpenGL/GLES3/flextGL.h.template

@@ -48,6 +48,7 @@
 #define __gl2_h_
 #define __gl3_h_
 #define __gl31_h_
+#define __gl32_h_
 #define __gl2ext_h_
 #define __gl3ext_h_
 #define __gl2platform_h_

src/MagnumExternal/OpenGL/GLES3/flextGLEmscripten.h

@@ -44,6 +44,7 @@
 #define __gl2_h_
 #define __gl3_h_
 #define __gl31_h_
+#define __gl32_h_
 #define __gl2ext_h_
 #define __gl3ext_h_
 #define __gl2platform_h_

src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h

@@ -47,6 +47,7 @@
 #define __gl2_h_
 #define __gl3_h_
 #define __gl31_h_
+#define __gl32_h_
 #define __gl2ext_h_
 #define __gl3ext_h_
 #define __gl2platform_h_

src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h.template

@@ -48,6 +48,7 @@
 #define __gl2_h_
 #define __gl3_h_
 #define __gl31_h_
+#define __gl32_h_
 #define __gl2ext_h_
 #define __gl3ext_h_
 #define __gl2platform_h_