Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

ar: diff reduction against ELF Tool Chain

Drop exit status from bsdar_errc. ELF Tool Chain always returns
EXIT_FAILURE in bsdar_errc.

Recommit of one part of d20e9e02db3d / review D31496.

Obtained from: ELF Tool Chain
Sponsored by: The FreeBSD Foundation

Revert "ar: diff reduction against ELF Tool Chain"

This reverts commit d20e9e02db3dde383c3de1ce8cec3a8c35b3eee6.
It caused port build failures.

Reported by: cy

ar: diff reduction against ELF Tool Chain

- Drop exit status from bsdar_errc. ELF Tool Chain always returns
EXIT_FAILURE in bsdar_errc.

- Remove ar_mode_* wrappers and call ar_read_archive / ar_write_archive
directly.

Obtained from: ELF Tool Chain
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31496

usr.bin/ar: use standard 2-Clause FreeBSD license

Many licenses on ar files contained small variations from the standard
FreeBSD license text. To avoid license proliferation switch to the usual
2-clause FreeBSD license after obtaining permission from all copyright
holders.

Approved by: jkoshy, kaiw, kientzle
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D14561

usr.bin/ar: remove incorrect SPDX tags

Three ar files have a non-standard variation of the BSD license, so
remove their SPDX tags.

Sponsored by: The FreeBSD Foundation

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Revert most part of 200420 as requested, as more review and polish is
needed.

Remove unneeded header includes from usr.bin/ except contributed code.

Tested with: make universe

- Import the HEAD csup code which is the basis for the cvsmode work.

Import ar(1) front-end. (aka 'BSD' ar)

Reviewed by: jkoshy
Approved by: jkoshy (mentor)
Tested by: erwin (ports build test on pointyhat)
Sponsored by: Google Summer of Code 2007
Reviewed by (earlier version): Jaakko Heinonen <jh[AT]saunalahti.fi>
Tested by (earlier version): Steve Kargl <sgk[AT]troutmask.apl.washington.edu>
Tested by (earlier version): Martin Voros <martin_voros[AT]yahoo.com>
Tested by (earlier version): swell.k[AT]gmail.com
Tested by (earlier version): joel
Tested by (earlier version): Alexey Shuvaev <shuvaev[AT]physik.uni-wuerzburg.de>
Tested by (earlier version): Arjan van Leeuwen <avleeuwen[AT]gmail.com>

Thanks to gabor@ for building ports for it.
Thanks to erwin@ and kris@ for scheduling the ports build test on pointyhat.
And thanks to many others for their feedback.