update GStreamer MediaRenderer to not propagate Seeking-capability when handling a http-stream
update GStreamer MediaRenderer to not propagate Seeking-capability when handling a http-stream

sreichholf/python-coherence,furbrain/Coherence,opendreambox/python-coherence,unintended/Cohen,furbrain/Coherence,coherence-project/Coherence,coherence-project/Coherence,sreichholf/python-coherence,opendreambox/python-coherence,unintended/Cohen,ismaelgaudioso/Coherence,ismaelgaudioso/Coherence