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Closing obsolete SDL-ryan-multiple-audio-device named branch

Removed distinction between "available" and "init" in audio backends, since
both had to be checked for success as a pair at the higher level and several
of the Available methods were just always-succeed placeholders anyhow. Now
the availability check is done in the init code, and the higher level tries
all possible drivers until one manages to initialize successfully.

ALSA's availability test was wrong in multi-device land. If the ALSA libraries
are available, we should use them and report zero available devices instead.

I really don't want to update these last two audio backends...I added an
error that says if no one complains, the backends will be removed eventually.
So if anyone ever wants them and they care enough to speak up, we'll know to
do something about it. If no one does, that's less code to maintain. :)

Added a FIXME.

Moved DirectSound audio target to SDL 1.3 API and did some house cleaning.

Moved windib (waveout) audio to 1.3 API and made other cleanups.

Some fixes that were discovered when trying to get OS/2 audio working again...

OS/2 audio code works in 1.3 now.

This file probably got corrupted by a pretty printer at some point...

BeOS audio now works in 1.3 branch.

Patched to build on pre-C99 compilers.

Patched to build on pre-C99 compilers.

Still more PAudio renames...

Whoops, changed that symbol name...

Paudio driver moved to 1.3 API.

Forgot to add NTO_Init()...

Fixed some things to use SDL C runtime functions.

Moved NTO audio driver to 1.3 API.

Fixed duplicate include-once blockers.

Moved mme audio driver to 1.3 API.

Minor fixes in dsp driver.

Dynamic loading for NAS audio driver.

Minor ALSA dynamic loading fix.

Look for NAS libraries in normal paths (where Ubuntu installs them).

Minor NAS tweak.

Moved NAS audio driver to 1.3 API.

Moved more audio drivers to 1.3 API (all 5 MiNT backends, BSD, IRIX...), and
some other tweaks in already-converted drivers.

Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
BeOS). None are tested, so anyu could fail to compile.

Mangled ALSA dynamic loading...static loading will still work if you have the
right libraries, but this is expected to break in general cases as we start
dealing with different symbol versions, etc (but may work with, say,
distro-specific packages, etc).