[SDL] ALSA/OSS linux audio driver priorities

[Ryan C. Gordon]

> Something (an issue with either a driver/dmix/sdl or combination of the
> previous pieces) is still here. See
> https://bugs.launchpad.net/ubuntu/+bug/66483 .

It seems strange that it's only when you change the volume in the 
game...that sounds like it would have to be an SDL_mixer bug, but I'm 
wondering if that part is bogus.

I've posted a request for more information on that report.

--ryan.