cmake: bump version requirement to 2.8.9 to make use of CMAKE_POSITION_INDEPENDENT_CODE
cmake: bump version requirement to 2.8.9 to make use of CMAKE_POSITION_INDEPENDENT_CODE

CMAKE_POSITION_INDEPENDENT_CODE will tell the build system to
automatically use -fPIC / -fPIE when appropriate.

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