partially port the mpegstream plugin to GStreamer 0.9.

partially port the mpegstream plugin to GStreamer 0.9.

Original commit message from CVS:
2005-11-14  Martin Soto  <martinsoto@users.sourceforge.net>

* configure.ac:
* gst/mpegstream/Makefile.am:
* gst/mpegstream/gstdvddemux.c:
* gst/mpegstream/gstdvddemux.h:
* gst/mpegstream/gstmpegdemux.c:
* gst/mpegstream/gstmpegdemux.h:
* gst/mpegstream/gstmpegpacketize.c:
* gst/mpegstream/gstmpegpacketize.h:
* gst/mpegstream/gstmpegparse.c:
* gst/mpegstream/gstmpegparse.h:
* gst/mpegstream/gstmpegstream.c:
* gst/mpegstream/gstrfc2250enc.c:
* gst/mpegstream/gstrfc2250enc.h:
Applied patch from Josef Zlomek <josef.zlomek@xeris.cz> to
partially port the mpegstream plugin to GStreamer 0.9.