gst recipes: Also move back from tarballs to git
gst recipes: Also move back from tarballs to git

I accidentally pushed the previous incomplete commit straight to master.

nirbheek/cerbero,fluendo/cerbero,GStreamer/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero,fluendo/cerbero,GStreamer/cerbero,GStreamer/cerbero,nirbheek/cerbero,nirbheek/cerbero,atsushieno/cerbero,atsushieno/cerbero,atsushieno/cerbero,fluendo/cerbero,fluendo/cerbero,GStreamer/cerbero,atsushieno/cerbero,fluendo/cerbero