optimise away unneeded flag sets

- especially useful for thumb code and larger max block sizes
- can still be improved upon

src/libui_sdl/main.cpp

@@ -2675,6 +2675,8 @@ void RecreateMainWindow(bool opengl)
 
 int main(int argc, char** argv)
 {
+    freopen("miauz.txt", "w", stdout);
+
     srand(time(NULL));
 
     printf("melonDS " MELONDS_VERSION "\n");