Silence compiler warning in tst_qrhi.cpp

Amends: 51979cfa172ebd89cf0235c6d8b6ccb97610c04d

Pick-to: 6.9 6.8
Change-Id: Ia9c553568ba3326bb971c833839a6f9c24240046
Reviewed-by: Magdalena Stojek <magdalena.stojek@qt.io>
Reviewed-by: Mate Barany <mate.barany@qt.io>

tests/auto/gui/rhi/qrhi/tst_qrhi.cpp

@@ -323,6 +323,9 @@ bool tst_QRhi::isAndroidOpenGLSwiftShader(QRhi::Implementation impl, const QRhi
 #ifdef Q_OS_ANDROID
     if (impl == QRhi::OpenGLES2 && rhi->driverInfo().deviceName.contains("SwiftShader"))
         return true;
+#else
+    Q_UNUSED(impl);
+    Q_UNUSED(rhi);
 #endif
     return false;
 }