Force Qt to use GLES if desktop GL is not available

Some platforms like the VisionFive 2 don't have working desktop GL,
so they must use GLES to be able to render at all. Qt doesn't try
to fall back if it fails to find a compatible EGL config, so we must
do so ourselves.

app/main.cpp

@@ -550,7 +550,9 @@ int main(int argc, char *argv[])
 #endif
     }
 
-    if (WMUtils::isRunningNvidiaProprietaryDriverX11() || qEnvironmentVariableIntValue("FORCE_QT_GLES")) {
+    if (WMUtils::isRunningNvidiaProprietaryDriverX11() ||
+        !WMUtils::supportsDesktopGLWithEGL() ||
+        qEnvironmentVariableIntValue("FORCE_QT_GLES")) {
         // The Nvidia proprietary driver causes Qt to render a black window when using
         // the default Desktop GL profile with EGL. AS a workaround, we default to
         // OpenGL ES when running on Nvidia on X11.