CMakeLists.txt: actually require GStreamer 1.2.0
CMakeLists.txt: actually require GStreamer 1.2.0

dejunk/gstreamer,nasserGanjali/QtGStreamer,knuesel/qt-gstreamer,nasserGanjali/QtGStreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,tswindell/qt-gstreamer,GStreamer/qt-gstreamer,tswindell/qt-gstreamer,dejunk/gstreamer,detrout/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,iperry/qt-gstreamer,dejunk/gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,GStreamer/qt-gstreamer,iperry/qt-gstreamer,iperry/qt-gstreamer,nasserGanjali/QtGStreamer,GStreamer/qt-gstreamer,detrout/qt-gstreamer,detrout/qt-gstreamer,knuesel/qt-gstreamer,tswindell/qt-gstreamer,knuesel/qt-gstreamer