contrib/ffmpeg: Yet an other fix attempt for ffmpeg. (Previous fix is broken because of registers don't get reseted properly in the look).

svn: contrib/ffmpeg: Work around the fact that there is not enough register available on Mac OS X/x86 for certain optimization (most likely a gcc bug).

Has anyone been able to encode TO theora with VLC lately ?

btw, faad2.6 is out and they have supposedly changed their headers...

contribs: don't try to install the shared library if it doesn't exist, fix [22437]. Spotted by John Dalgliesh

Reverse previous workaround for pthreads lib having GC2 suffix - that
is actually normal; patch should instead go into x264 to make it ignore
the presence of a local pthread lib under cygwin when doing configure tests.

Contribs: take libebml and libmatroska from released versions... Way easier to not compile it everytime.

cross-compiling under linux. -Im4/ changed to -I m4/

picked up in configure due to bracket in wrong place.

Contribs - FLAC: update to v1.2.1. Mingw32 patch is unneeded (upstream merge). A few bugs and crash are fixed, new support for all RIFF/AIFF metadata, including Broadcast Wave Format (BWF).

Contribs: Theora moves from alpha7 to alpha8. New encoder, one patch has gone upstream, and examples can be disabled. A lot of new features are available in the encoder. Postprocessing, anyone ?
Ref  #1303