lets tendra build again.
ok deraadt@, pvalchev@, millert@

ok millert@ deraadt@ jason@

from Daniel Lucq

ok beck@ millert@

Bring carp interfaces down at shutdown, to make a graceful exit if we're master.
ok deraadt@

ok deraadt@

ok deraadt@

ok markus@ henning@

switching to that securelevel, and the clock is off by more than
128ms, ntpd will attempt to correct by stepping the clock instead of
slewing it. So use -x in that case; from tholo

ok marc@ fgsch@

advance. From Thorsten Lockert.

No regen necessary except for hp300 MAKEDEV.8

Allows others to build OpenBSD/cats, use binutils from devel/binutils/stable
Requested by deraadt@

ok beck@, input from many.

reasons for this, quite a few of them technical, and not all of them
in response to Intel's broken ia32e crud.  The gcc toolchain stays at
x86_64 for now.

ok mcbride@

ok millert@

diffs from Paul de Weerd;
ok deraadt@

- refer to the section 4 manual page for every device target, whenever
possible
- repair a few minor quoting errors
- repair a few sorting errors
- fix a few device descriptions (ideally they would be synched with the
.Nd line of their manpages, but we are not there... yet)
- minor mdoc fixes
Thanks to jmc@ for review and a lot of constructive criticism.