union wait

[David Holland <dholland-tech%netbsd.org@localhost>]

We still have elements of union wait hanging around in sys/wait.h.
This has been deprecated for > 20 years; does anyone mind if I G/C
them?

(I think just about all the legacy code in pkgsrc that uses union wait
has been fixed by now as it doesn't exist on a number of other
systems; but if not, it's not like it's a big patching effort to
eradicate it.)

-- 
David A. Holland
dholland%netbsd.org@localhost