Added OpenGL includes for Mac OS X

~g2k

include/level.h

@@ -9,7 +9,15 @@
 #include <cctype>
 #include <cmath>
 #include <iostream>
+#ifdef WIN32
 #include <GL/gl.h>
+#endif
+#ifdef __linux
+#include <GL/gl.h>
+#endif
+#ifdef __APPLE___
+#include <gl.h>
+#endif
 #include <cstdio>			//for file I/O
 
 #include "mydefs.h"

include/mygl.h

@@ -3,9 +3,17 @@
 
 #ifdef WIN32
 #include <windows.h>	//Remove if possible
-#endif
 #include <GL/gl.h>
 #include <GL/glu.h>
+#endif
+#ifdef __linux
+#include <GL/gl.h>
+#include <GL/glu.h>
+#endif
+#ifdef __APPLE__
+#include <gl.h>
+#include <glu.h>
+#endif
 //#include <gl/glaux.h>	//Hopefully nothing needs this remove if it works in windows
 #include <string>
 #include "datatypes.h"