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/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.cpp

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