Minor Win32 compilation fixes.

src/tiler.cpp

@@ -6,6 +6,10 @@
 #include "tiler.h"
 #include "tileset.h"
 
+#if defined WIN32
+#   define strcasecmp _stricmp
+#endif
+
 /*
  * Tiler implementation class
  */

src/tileset.cpp

@@ -8,7 +8,6 @@
 #else
 #   define GL_GLEXT_PROTOTYPES
 #   include <GL/gl.h>
-#   include <GL/glext.h>
 #endif
 
 #include <SDL.h>

src/video.cpp

@@ -8,7 +8,6 @@
 #else
 #   define GL_GLEXT_PROTOTYPES
 #   include <GL/gl.h>
-#   include <GL/glext.h>
 #endif
 
 #include <SDL.h>