mesa: Don't include sys/types.h on WinCE.

We probably shouldn't be including sys/types.h at all, but let's leave that
for another time.

include/GL/internal/glcore.h

@@ -36,7 +36,9 @@
 **
 */
 
+#if !defined(_WIN32_WCE)
 #include <sys/types.h>
+#endif
 
 #define GL_CORE_SGI  1
 #define GL_CORE_MESA 2