Changes:
10102003 - Changed some SDL_Error()s to __Sound_SetError() in new DLS code
to fix linking issues.
10052003 - Fixed memory corruption when freeing DLS instruments,
and bug when timidity is initialized multiple times (Thanks, Sam!).
09252003 - Sam Lantinga added support for DLS instruments to the MIDI decoder.
09132003 - Happy September. Added Speex (.spx) decoder.
08052003 - Fixed MIDI decoder on bigendian systems.
03102003 - Never actually created samplelist_mutex (Thanks, Glenn Maynard!).
01122003 - Fix to smpeg.c's rewinding code (Thanks, Eric).
12212002 - Fixed ogg.c to decode a full buffer at a time instead of one ogg
packet per call, and mikmod has a check during initialization to
prevent a clash with SDL_mixer (Thanks, Eric).
12092002 - Changed Sound_Init()'s call to SDL_Init() to SDL_InitSubSystem(),
to prevent unwanted use of the SDL parachute (thanks, Glenn).
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