The liba52 "codec" is now an audio filter. It means we are now able to

The liba52 "codec" is now an audio filter. It means we are now able to
autodetect S/PDIF hardware support and the audio output plug-in chooses
the best one. Of course it probably breaks existing output modules, see
oss.c for hints :).

Also include minor tweaks which will entitle us to decode and output 5.1
audio. It may break existing plug-ins, too. See
audio_output.c:aout_FormatNbChannels for hints.