[aquaria] [patch] Positional audio support

[Ryan C. Gordon]

> L/R panning, because OpenAL outright refuses to apply distance to stereo
> tracks (At least my OpenALSoft/win32 version does).

This is by design in the OpenAL specification, fwiw. There wasn't a 
clear answer to how to keep something stereo and still apply a position 
to it, plus most things that were stereo didn't _want_ to be positioned; 
they were usually the music track and not sounds emitted by the game world.

I'll look over the patch soon.

--ryan.