VLC tables should only be initialized from one place.
This initializes/calculates more VLC tables than necessary for VC1 decoding,
but this is only done once and only a small overhead in time and space (maybe
30 kB) it seems not worth adding a separate function.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20010 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b