OSs.

Change flock() error condition to errno=EWOULDBLOCK rather than errno!=EOPNOTSUPP
Therefore, any error that's not because of an existing lock is not a lock error.

For unix, use setvbuf to turn off stdout and stderr buffers
For unix, set con_fp to stdout instead of stderr (Why was it stderr?  This
would result in all output being logged!  Did nobody notice this?)
For unix, don't use TTY functions on non-tty
For unix, support stdio even if it's not a tty

This should fix the problems people are having with sbj and sbl from CVS builds
LET ME KNOW!

*.$os.exe.* test.

No duplicate IPs in sbbsimsg.lst.

read/write permissions).

clean rule now deletes target binaries.