restore it after cleaning out /var/run.  Since we don't have /usr
yet our options are limited here.
Without this change /var/run/dhclient.pid will be removed after
dhclient is started from /etc/netstart.

Change from:
o all interfaces
o all bridges
o routes
to:
o physical interfaces
o routes
o gif and gre interfaces
o bridges
Fixeski PR #2400.
Manual page updates coming soon.
Ok angelos@ chris@ deraadt@

make sparc64 build ttyD{cfg,0,1,..,b}
move wscons) to 'target()' macros to make the above possible

this feels alot like distrib/sets .. mi global and md for everybody that's
gotta be different ..

o properly generate scsi scanner devices
o shorten pty generation shell fragment
o many tweaks for vax (audio what? how did I ever think vax had audio?)