com ports are not needed on ramdisk

re-order a few all and ramdisk targets to *try* to get lucky and
escape ksh's core's

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@

syntax error if the #define happens before stdlib.h is included.
If abs is #defined, #undef and issue a warning.  This is similar
to what Tru64 UNIX does and is effectively the same as what happens
on Solaris (though on Solaris the real abs() is a macro).

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

millert@ ok

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?)