ext/ffmpeg/Makefile.am: Prevent more symbol conflicts...

ext/ffmpeg/Makefile.am: Prevent more symbol conflicts...

Original commit message from CVS:
* ext/ffmpeg/Makefile.am:
Prevent more symbol conflicts...
* ext/ffmpeg/gstffmpegdec.c: (gst_ffmpegdec_register):
Up priority/rank for MPEG-4 decoder. Reason is simple: it's well-
tested and by far outperforms xviddec/divxdec. They'll get some
other, slightly lower, rank.
* gst-libs/ext/ffmpeg/patch/autotools.diff:
Tweaking...
* gst-libs/ext/ffmpeg/patch/disableinstalllibs.diff:
Prevent more symbol conflicts. I changed this (to pass 'make
distcheck') in the one patch, so need to change it here too.
* gst-libs/ext/ffmpeg/patch/disablemmx.diff:
Re-enable MMX. :).
* gst-libs/ext/ffmpeg/patch/functions.diff:
Bla.