ossaudio(3): refactor library into separate files

fix typo, WARNS=5

These directories don't handle WARNS=5

Remove USETBL, now that man page does not need tbl any longer.

Add a table that describes the mappings from native audio mixer names
to their OSS equivalents.

drop whitespace

use CPPFLAGS not CFLAGS

back out last change

don't build shared library

Install the "soundcard.h" include file in /usr/include, because:
- The documentation says <soundcard.h>, and
- You can't install an include into /usr/include/sys, because the user
might be using "s

Install the "soundcard.h" include file in /usr/include, because:
- The documentation says <soundcard.h>, and
- You can't install an include into /usr/include/sys, because the user
might be using "symlinks" for the sys includes.

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Initial version of a user level emulation of the OSS audio API.
Useful for compiling Linux audio programs.