Add listing feature patches (for firefox)

- http://cgit.freedesktop.org/gstreamer/gstreamer/commit/?id=17f92542646a6a08b87093402e688f348f651f8d
- http://cgit.freedesktop.org/gstreamer/gstreamer/commit/?id=0fe3a9bc22a0a7a7239b531a7eee4b4e6bcf53c6