too small

ok deraadt@

dhclient needs this to validate old (but valid) leases in
/var/db/dhclient.leases in case it needs to fall back to such a
lease.  (the dhcp server can be down or not responding)
Reported by Chris Jepeway.
"makes sense"  henning dhartmei

Also fix a signed vs. unsigned issue while I am at it.
Found by Jim Geovedi.  OK deraadt@

doesn't blow up.  This is a hack but is better than compiling sha1.c
with -O0 on sparc64.  From NetBSD (mrg).
deraadt@ OK

well as the few userland tools which were only used on these platforms.

There has not been enough activity and interest towards these platform
to keep them lying in the tree.

icmp protocol naming particularly with pfctl, since the manpage is
icmp6(4) (not ipv6-icmp(4)).
suggested by espie@, cleared with deraadt@, ok dhartmei@

we don't want any user defines to change how the inlined ctype
functions behave.

not EOF is defined to determine if stdio.h has been included.
Instead, use __EOF which should be OK wrt namespace safety.

ok deraadt@

-correct order
-various spelling/grammar/consistency
from David Krause with feedback from dhartmei@

o Add __BEGIN_DECLS/__END_DECLS to include files
o Safe macros
o Remove useless variable assignment in the End function of *hl.c
o Some minor KNF, needs more
From Dan Weeks