[AD] BeOS sound driver

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A patch against 3.9.32 is attached.  The patch might look a little
funny in some places -- I was trying to write a windowed driver at
the same time so I had to undo those changes.  Only tested on one
machine (BeOS 5 Personal Edition, p233).

I took the easy way out and used the Allegro software mixer.  If the
driver were to ask the OS to do the mixing for us, then we could get
hardware benefits.  But then the effects might not work (like in the
Windows version?) I haven't looked into this.

The driver spawns a new thread, like the keyboard driver.

Recording is not in, as it is a real pain to write.

The buffer size and thread priorities are guesstimated.  They work
here, but probably should be configurable.

tjaden@xxxxxxxxxx - http://www.psynet.net/tjaden/

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