Original commit message from CVS: drop mpeg2dec 0.2.1 support in favor of 0.3.0. keeping old code around in cvs for a while just in case someone needs it.
All aclocal .m4 files we need are put here and cat'd to acinclude.m4 in the source root. Official ones (taken from the relevant devel packages) are named as-is, unofficial ones (or changed ones) get a gst-prefix.