Remove need for defining _MSC_VER when building Mesa for windows with
a non MS C compiler (MinGW). (Gregor Anich)
diff --git a/include/GL/glut.h b/include/GL/glut.h
index 3a67f1f..7977dc9 100644
--- a/include/GL/glut.h
+++ b/include/GL/glut.h
@@ -75,7 +75,7 @@
To avoid the atexit workaround, #define GLUT_DISABLE_ATEXIT_HACK. */
/* XXX This is from Win32's <process.h> */
-# if !defined(_MSC_VER) && !defined(__cdecl)
+# if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(__cdecl)
/* Define __cdecl for non-Microsoft compilers. */
# define __cdecl
# define GLUT_DEFINED___CDECL
@@ -108,7 +108,7 @@
and redifinition of Windows system defs, also removes requirement of
pretty much any standard windows header from this file */
-#if (_MSC_VER >= 800) || defined(_STDCALL_SUPPORTED) || defined(__CYGWIN32__)
+#if (_MSC_VER >= 800) || defined(__MINGW32__) || defined(_STDCALL_SUPPORTED) || defined(__CYGWIN32__)
# define GLUTAPIENTRY __stdcall
#else
# define GLUTAPIENTRY