Fix warning for -no-feature-cursor

Change-Id: I58a2bd715ff1767571d076a881872bd5eab2caec
Reviewed-by: Stephan Binner <stephan.binner@basyskom.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

src/plugins/platforms/vnc/qvncscreen.cpp

@@ -131,6 +131,8 @@ void QVncScreen::enableClientCursor(QVncClient *client)
     if (!clientCursor)
         clientCursor = new QVncClientCursor();
     clientCursor->addClient(client);
+#else
+    Q_UNUSED(client)
 #endif
 }
 
@@ -144,6 +146,8 @@ void QVncScreen::disableClientCursor(QVncClient *client)
     }
 
     mCursor = new QFbCursor(this);
+#else
+    Q_UNUSED(client)
 #endif
 }