[mythtv] mythmusic integration patch

[Ed Wildgoose]

Attached is a cleaned up version of my patch to integrate the mythmusic 
audio layer into the main libmyth audio.  This means that alsa, core 
audio, directx, etc can all be used for audio output.  And also volume 
control should work with those output drivers.

I'm sure there are a bunch of bugs introduced, but I have been using it 
fine here for quite a while now... If you spot anything then please let 
me know.

http://www.wildgooses.com/downloads/mythmusic_audio.tar.gz

Thor/Isaac, can you please commit this to cvs so that I can get some 
wider testing

Thanks

Ed W