Changes for Win32 port

[Ryan C. Gordon]

> When I compiled and used playsound.exe with SDL_sound.lib,
> ogg_static.lib, vorbis_static.lib, and vorbisfile_static.lib linked in,
> it worked fine with wav's, ogg's, and aif's.  It plays .VOCs, but sounds
> odd; I'm uncertain as to which is the problem, the code or the .voc.
> Lastly, I don't have a .shn handy to test it with so I just don't know.

Please email me the questionable .VOC file, and I'll take a look. The VOC
code isn't very heavily tested.

Here's a .SHN known to work on my system:

http://icculus.org/SDL_sound/downloads/example_sounds/grateful-dead-02281969-intro.shn

 (It's about 700k worth of data.)

There's some silence at the beginning, followed by some guy saying
"without any further ado: The Grateful Dead".

The SHN code is even less tested than the VOC code.  :)

If y'all could point me to some good example soundfiles in different
formats, I'll put them in the example_sounds directory on the website. I'm
looking for small, legally redistributable files.

--ryan.