Gst player backend: removed fifo based stream playback fallback

It was used on systems without appsrc element support,
but since the appsrc is part of base elements for a long,
thre is a very little value in fifo based fallback.

Change-Id: I162233cbb55821443c892f00ebd29c0498ae7152
Reviewed-by: Ling Hu <ling.hu@nokia.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/gstreamer/mediaplayer/qgstreamerplayerserviceplugin.cpp

@@ -85,7 +85,11 @@ QMediaServiceProviderHint::Features QGstreamerPlayerServicePlugin::supportedFeat
         const QByteArray &service) const
 {
     if (service == Q_MEDIASERVICE_MEDIAPLAYER)
-        return QMediaServiceProviderHint::StreamPlayback | QMediaServiceProviderHint::VideoSurface;
+        return
+#ifdef HAVE_GST_APPSRC
+                QMediaServiceProviderHint::StreamPlayback |
+#endif
+                QMediaServiceProviderHint::VideoSurface;
     else
         return QMediaServiceProviderHint::Features();
 }