[sdlsound] Sound_AvailableDecoders

[Ryan C. Gordon]

> By the way,  how SDL_sound  implement decoders? How it work with decoder
> modules? How it finds decoder modules? May be, I havent copy needed files
> into sdl_sound folder to implement decoder DLLs. can it be ?

For the most part, the decoders are statically linked with SDL_sound; if
there's an external DLL (like the Ogg Vorbis libs) and that DLL is
missing, the program wouldn't even start.

--ryan.