Fixed the Apple SDL_opengl.h conflict in the 1.2 branch.

Author: icculus

include/SDL_opengl.h

@@ -3108,9 +3108,14 @@ typedef char GLchar;			/* native character */
 
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
+#ifdef __APPLE__
+typedef long GLintptr;
+typedef long GLsizeiptr;
+#else
 typedef ptrdiff_t GLintptr;
 typedef ptrdiff_t GLsizeiptr;
 #endif
+#endif
 
 #ifndef GL_ARB_vertex_buffer_object
 /* GL types for handling large vertex buffer objects */