fixed a typo in GL_MESA_resize_buffers
diff --git a/include/GL/glext.h b/include/GL/glext.h
index 6608d3b..934c7f6 100644
--- a/include/GL/glext.h
+++ b/include/GL/glext.h
@@ -1307,7 +1307,7 @@
 /*
  * 196. GL_MESA_resize_bufffers
  */
-#ifndef GL_MESA_resize_bufffers
+#ifndef GL_MESA_resize_buffers
 #define GL_MESA_resize_buffers 1
 
 GLAPI void APIENTRY glResizeBuffersMESA(void);