Allow CK to terminate on FreeBSD

[Joe Marcus Clarke]

I dug into the FreeBSD kernel some more, and found that if signal
handlers are registered, the tsleep() function will know which signals
are allowed to interrupt the ioctl syscall, thus causing it to return
EINTR.  Based on this, I put together this patch which fixes the
termination problem.  It may not be the ideal place for the signal
handler registration, but it does the job.

I can send a formal git patch once people have a chance to comment.

Joe
-- 
Joe Marcus Clarke
FreeBSD GNOME Team      ::      gnome at FreeBSD.org
FreeNode / #freebsd-gnome
http://www.FreeBSD.org/gnome
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