Ported DVdec to 0.9.

Ported DVdec to 0.9.

Original commit message from CVS:
* configure.ac:
* ext/dv/Makefile.am:
* ext/dv/gstdvdec.c: (gst_dvdec_class_init), (gst_dvdec_init),
(gst_dvdec_get_src_query_types), (gst_dvdec_src_query),
(gst_dvdec_handle_sink_event), (gst_dvdec_handle_src_event),
(gst_dvdec_video_getcaps), (gst_dvdec_video_setcaps),
(gst_dvdec_decode_audio), (gst_dvdec_decode_video),
(gst_dvdec_decode_frame), (gst_dvdec_chain),
(gst_dvdec_change_state), (gst_dvdec_set_property),
(gst_dvdec_get_property), (plugin_init):
* ext/dv/gstdvdec.h:
* ext/esd/esdsink.c: (gst_esdsink_class_init):
Ported DVdec to 0.9.
Parent of esdsink is GstAudioSink.