New: telephony/chan_unistim

[Ian Darwin]

Unistim is the proprietary protocol used by Nortel i2004 and similar 
phones. chan_unistim is a revenged implementation of unistim for the 
Asterisk open source PBX; as such this port depends on Asterisk.

Comments welcome on anything that needs improving before it goes in
(e.g, it doesn't yet honor CC/CFLAGS).
Tested with * running on amd64; also built on i386.

Port is at http://www.darwinsys.com/openbsd/myports/chan_unistim.tar.gz

Thx