added a buch of

#ifdef __APPLE__
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif
(also for <GL/glu.h>)

so that people don't have to create symlinks in
/System/Library/Frameworks/OpenGL.framework on Mac OS X
(Charles Wardlaw)

source/gameengine/BlenderRoutines/KX_BlenderCanvas.h

@@ -35,7 +35,11 @@
 #ifdef WIN32
 #include <windows.h>
 #endif 
+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#else
 #include <GL/gl.h>
+#endif
 
 #include "RAS_ICanvas.h"
 #include "RAS_Rect.h"