[MPlayer-dev-eng] [PATCH-ISH] fix thread-safety in libass

[elupus]

Hi, 

While using libass in xbmc, i noticed that it's not very threadsafe or even
multiuse safe as it uses alot of global state. So i started to clean it up
for our use.

I though i'd make the patch series available here. These patches are a
patch series applied to our branched libass, thus they will probably not
apply entirely cleanly to the version in mplayerhq. 

I made sure to update our libass to current mplayerhq version, so the
differences should be minimal.

I've got little interest in cleaning them up for acceptance into mplayer
svn (but I think it wouldn't be that much work), so this is mearly a help
for anybody that wishes todo so (Evgeniy probably).

Regards
Joakim
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