backport QtGStreamer 1 support (#1092659)
* Wed Jul 23 2014 Kevin Kofler <Kevin@tigcc.ticalc.org> - 4.1.0-3
- apply upstream patch to handle QtGstreamer API 1.0 in VideoSlideShow tool;
whether to build against QtGStreamer 0.10 or 1.x is autodetected (#1092659)