Use EGL_VENDOR instead of NV-CONTROL for Nvidia detection

The latter will still match on a hybrid system when the iGPU's EGL
implementation is in use. This scenario works properly with EGL
rendering in Qt and SDL, so we want to allow that.

app/utils.h

@@ -7,9 +7,10 @@
 
 namespace WMUtils {
     bool isRunningX11();
-    bool isRunningX11NvidiaProprietaryDriver();
+    bool isRunningNvidiaProprietaryDriver();
     bool isRunningWayland();
     bool isRunningWindowManager();
     bool isRunningDesktopEnvironment();
+    bool isEGLSafe();
     QString getDrmCardOverride();
 }