OK natano on a previous diff which used a different uid/gid.
naddy@ pointed out that uid/gid was already taken on "important" systems.
Turns out we cannot easily recycle freed up uids/gids so settle on 51.

ok deraadt@ sthen@ florian@

or prototypes.  Ditto for some of the char* and void* casts too.
verified no change to instructions on ILP32 (i386) and LP64 (amd64)
ok natano@ abluhm@ deraadt@ millert@

OK guenther@

ok guenther@

it can be worked on in the tree).
ok florian@ deraadt@

ok tedu@

reported by brynet

ok florian

OK halex

ok reyk@, bcook@

obvious why it is implemented this way.  The whole idea of constraints
is to isolate them as much as possible, in a semi-paranoid way.
OK rzalamena@

OK from the original author Alexander Guy

ok deraadt@ millert@

to a local equivalent to eliminate a dependency on <sys/time.h> being
included
ok deraadt@ millert@

matter much -- and "uucp" is just stupid in 2016.
ok rpe

from rpe

should be owned by root.
ok deraadt

Found by landry
OK deraadt

While here, convert `` to $().
OK halex

OK halex

OK halex, krw

through and try whatever it can do with the invoking user's perms
feedback/ok aja@ rpe@

update the NULL definition for C++11.  OK deraadt@ guenther@ kettenis@

Based on a diff from Anthony Coulter.
OK krw, halex

OK tb

to /dev/audio*. No port is using them (thanks to sthen@ for checking).
ok sthen@

while here, remove the comment for man6, according to ingo's system...

we don't end up with cryptic error messages.
Regex help from rpe@
Issue reported by Anthony Coulter in rcctl(8), but better fix the root cause.
Also clarify the mage page that rc.d script name must follow ksh(1) variable
naming.
ok robert@ sthen@

before descending, after ascending, but not around single-subdir dirs

While here, also remove two forgotten descriptions for long obsolete
devices.

ok phessler

the SHA512/256 functions as well.