Merge pull request #2207 from unknownbrackets/mpeg-fix

Allow an mpeg to finish even not completely at stream end
Cleanup some SAS constructors.
sceSasInit() ignores maxVoices and always does 32.

Weird, I can't find anything that parameter does except generate errors.
Most games call with 32 anyway...

Affects only sceSasGetEndFlag() and sceSasGetPauseFlag() really.