optimize mac again

Yuhang Zhao

2023-12-18 326b23bf678301a72cb9d67ac64347dd5ce49a37

 examples/mainwindow/main.cpp

@@ -7,7 +7,6 @@
int main(int argc, char *argv[]) {
    qputenv("QT_WIN_DEBUG_CONSOLE", "1");
    qputenv("QSG_INFO", "1");
    qputenv("QT_WIDGETS_HIGHDPI_DOWNSCALE", "1");
#if 0
    qputenv("QT_WIDGETS_RHI", "1");
    qputenv("QSG_RHI_BACKEND", "d3d12");