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

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

- Fix terminating argument to execl(3), sizeof(NULL) != sizeof(char *)
might be true on some systems [1]
- Rewrite gotos to use return directly
- Some spelling fixes
- Reduce unneeded/non-standard Makefile settings

Requested by: bde, imp [1]
Explanation provided by: bde [1]
Reviewed by: imp

$Id$ -> $FreeBSD$

This commit was generated by cvs2svn to compensate for changes in r48730,
which included commits to RCS files with non-trunk default branches.

The apmd package provides a means of handling various APM events from
userland code. Using apmd.conf, the apmd(8) configuration file, you
can select the APM events to be handled from userland and specify the
commands for a given event, allowing APM behaviour to be configured
flexibly.

Have Fun!

Submitted by: iwasaki, KOIE Hidetaka <hide@koie.org>
Reviewed by: -hackers, -mobile and bsd-nomads ML folks.
Contributed by: Warner Losh <imp@FreeBSD.org>,
Hiroshi Yamashita <bluemoon@msj.biglobe.ne.jp>,
Yoshihiko SARUMARU <mistral@imasy.or.jp>,
Norihiro Kumagai <kuma@nk.rim.or.jp>,
NAKAGAWA Yoshihisa <nakagawa@jp.FreeBSD.org>, and
Nick Hilliard <nick@foobar.org>.