Updates...

[Ryan C. Gordon]

(this is in CVS.)

...decoders can now list multiple file extensions, which is very helpful
for the MikMod code, since it lists 16 different supported formats.   :)
Playsound has been updated to handle this. It breaks backwards
compatibility, but seeing as playsound is the only thing using SDL_sound
at the moment, I think we can forgive that.

...playsound now catches SIGINT, and will jump to the next file in the
playlist when the signal is fired. If the signal is fired twice in
relatively rapid succession (within 400 ms of the last SIGINT), playsound
cleanly shuts down. This is much like how mpg123 behaves.

--ryan.