Better Mac OS X build fix - actually match the SDK OpenGL headers.
diff --git a/include/SDL_opengl_glext.h b/include/SDL_opengl_glext.h
index d59fc09..7e840f7 100644
--- a/include/SDL_opengl_glext.h
+++ b/include/SDL_opengl_glext.h
@@ -466,8 +466,8 @@ GLAPI void APIENTRY glBlendEquation (GLenum mode);
#define GL_VERSION_1_5 1
#include <stddef.h>
#ifdef __MACOSX__
-typedef ssize_t GLsizeiptr;
-typedef ssize_t GLintptr;
+typedef long GLsizeiptr;
+typedef long GLintptr;
#else
typedef ptrdiff_t GLsizeiptr;
typedef ptrdiff_t GLintptr;