st/mesa: use GLuint to avoid problem w/ uint not defined on mingw32

src/mesa/state_tracker/st_atom.h

@@ -67,6 +67,6 @@ extern const struct st_tracked_state st_update_vs_constants;
 extern const struct st_tracked_state st_update_pixel_transfer;
 
 
-uint st_compare_func_to_pipe(GLenum func);
+GLuint st_compare_func_to_pipe(GLenum func);
 
 #endif