Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

ANSIfy almost all applications that use WARNS=6.

I was considering committing all these patches one by one, but as
discussed with brooks@, there is no need to do this. If we ever
need/want to merge these changes back, it is still possible to do this
per application.

Cleanup of userland __P use

do_file() is called recursively from several places and cannot
safely free() anything related to items that may be recursed on.

Obtained from: DragonFly (rev 1.7, dillon)
PR: bin/94767
MFC After: 1 month

Fix a "free(): error: chunk is already free" under certain
circumstances that include circular dependencies.

PR: bin/91789
PR submitted by: Frank Behrens <frank@pinky.sax.de>
Patch submitted by: Divacky Roman <xdivac02@stud.fit.vutbr.cz>

This commit was generated by cvs2svn to compensate for changes in r98567,
which included commits to RCS files with non-trunk default branches.

Sync with NetBSD.
* don't whine about non-regular files. It is perfectly normal to keep a
CVS or RCS directory in /etc/rc.d.
* manpage tweak

Import the NetBSD 1.5 RC system.

Note that `rc' and `rc.shutdown' could not be imported because we already
have files with those names.