openssh changes:
- SIGWINCH propagated correctly
- mitigate SSH1 traffic analysis
- sprintf -> snprintf and lots of other cleanups
netbsd local changes:
- include OpenBSD RCSID into binary again, which helps us diagnose later.
with openssh tree to ease future upgrade. re-do local changes, including:
- prototype pedants
- IgnoreRootRhosts
- login.conf user validation
some of the local changes that weren't used are omitted for now. we may
need to revisit those afterwards.
it adds "sftp".
