ext/ogg/: Mark delta units in the muxer.

ext/ogg/: Mark delta units in the muxer.

Original commit message from CVS:
* ext/ogg/gstoggdemux.c: (gst_ogg_demux_iterate),
(gst_ogg_pad_push):
* ext/ogg/gstoggmux.c: (gst_ogg_mux_init),
(gst_ogg_mux_request_new_pad), (gst_ogg_mux_next_buffer),
(gst_ogg_mux_buffer_from_page), (gst_ogg_mux_push_page),
(gst_ogg_mux_send_headers), (gst_ogg_mux_loop):
Mark delta units in the muxer.
Try to decode the packet after an out-of-sync error from
libogg.