This merges in the latest NetBSD sup source.

This merges in the latest NetBSD sup source.
- removed $Log: ...$ tags to not waste space in the repository
- now doesn't segfault on the alpha!

Note:
To compile sup on systems other than *BSD, you'll need a copy of
vis.c, vis.h, daemon.c, and sys/cdefs.h.  At least the first two
(for OSF/1).

From NetBSD changelog description (for credit where due):
.... 1996/12/23 19:42:05  christos
- add missing prototypes.
- fix function call inconsistencies
- fix int <-> long and pointer conversions
It should run now on 64 bit machines...

....  1996/12/31 18:08:00  christos
64 bit patches (mostly long -> time_t) from Matthew Jacob (?)
sup now works on the alpha!