doom/sndserv

This is the soundserver as used by the original
Linuxdoom release. I separated the source from
the actual Linuxduum source. For various reasons
the separate sound process seems to give the
best results - both synchronous and timer driven
output demonstrate glitches. These might either
be timing issues, or introduced by the changes
I made to the linux sound code while merging it
back into the main tree.

Note that neither John Carmack nor Dave Taylor
are responsible for the current sound handling.