Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Create the /bin/rmail symlink (which mailers such as postfix
and Exim can use).

This is something I thought I committed MONTHS ago, but it appears
that I fatfingered it and made a local commit.

Pass the pointy hat, please.

The last big commit: let usr.sbin/ use WARNS=6 by default.

Cleanups for mailwrapper(8):
- K&R -> ANSI prototype [O]
- Do not bother to do free right before exit() or execve() [O]
- Remove some dead code in addarg()
- Make additional parameters specified in mailer.conf(5)
actually work and document the fact. [N]
- Avoid using __progname but instead use getprogname()
and setprogname() to provide more sensible messages. [O, N]
- Update $OpenBSD$ and $NetBSD$ to reflect the fact that we
have sync'ed with their code.
- WARNS=6

Obtained from/Inspired by: OpenBSD [O], NetBSD [N] (partially)

Reimplementation of world/kernel build options. For details, see:

http://lists.freebsd.org/pipermail/freebsd-current/2006-March/061725.html

The src.conf(5) manpage is to follow in a few days.

Brought to you by: imp, jhb, kris, phk, ru (all bugs are mine)

Replaced afterinstall: with FILES.

Do not install SYMLINKS if both NO_MAILWRAPPER and
NO_SENDMAIL is defined.

PR: 57058
Reported by: Henri Hennebert <hlh@cocoon.cercle.be>
Melvyn Sopacua on current@
Submitted by: ru@
MFC after: 2 weeks

Drop support for COPY, -c has been the default mode of install(1)
for a long time now.

Approved by: bde

If NO_MAILWRAPPER is set, and sendmail is still enabled, then install
a direct symlink to sendmail.

Add the missing hoststat and purgestat commands. These are normally
symlinks to the sendmail binary but in FreeBSD's case, they are
symlinks to mailwrapper.

Submitted by: tisco
MFC after: 4 days

Perform a major cleanup of the usr.sbin Makefiles.
These are not perfectly in agreement with each other style-wise, but they
are orders of orders of magnitude more consistent style-wise than before.

- Backout botched attempt to introduce MANSECT feature.
- MAN[1-9] -> MAN.

Set the default manual section for usr.sbin/ to 8.

Install mailer.conf as ${BINOWN}, ${BINGRP}, rather than root:wheel. This
lets unprivileged installworld: almost work first try and always work second.

BINOWN isn't quite right for this, but it's not really worth creating
a MAILOWN for this.

Preempt one brucification - I was missing a ${DESTDIR}. I hate merging
two sets of changes from different trees.

As a special case, deal with a missing mailer.conf at install time. I
don't particularly like doing this here, but the alternative (loosing mail)
is worse.

Make mailwrapper build

This commit was generated by cvs2svn to compensate for changes in r54816,
which included commits to RCS files with non-trunk default branches.

Import NetBSD's mailwrapper to redirect /usr/sbin/sendmail to the user's
chosen mailer.

Obtained from: NetBSD