win32_gl_common: Remove config includes

Author: mpiatka

src/win32_gl_common.c

@@ -39,18 +39,13 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#include "config_unix.h"
-#include "config_win32.h"
-#endif
-
 #include <assert.h>
 #include <stdbool.h>
 #include <GL/glew.h>
 #include <GL/wglew.h>
 #include <wingdi.h>
 #include <winuser.h>
+#include <pthread.h>
 
 #include "debug.h"
 #include "utils/windows.h"