Change

#define GLAPIENTRYP __stdcall *
to
#define GLAPIENTRYP GLAPIENTRY *
These two defs end up doing the same thing, but the compiler can squawk
because they look different.  Also matches the way it is declared in gl.h.
Do same for GLCALLBACKP.

src/mesa/main/glheader.h

@@ -107,9 +107,9 @@
 #    define WGLAPI __declspec(dllimport)
 #  endif /* _STATIC_MESA support */
 #  define GLAPIENTRY __stdcall
-#  define GLAPIENTRYP __stdcall *
+#  define GLAPIENTRYP GLAPIENTRY *
 #  define GLCALLBACK __stdcall
-#  define GLCALLBACKP __stdcall *
+#  define GLCALLBACKP GLCALLBACK *
 #  if defined(__CYGWIN__)
 #    define GLCALLBACKPCAST *
 #  else