Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

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.

Rename devname to udevname after including stdlib.h in r303445
as gcc trips over the devname(3) and reports 'shadows a global declaration'.

This should unbreak gcc based world builds.

Call basename() and dirname() in the POSIXly correct way.

Pull copies of the input string, as these functions are allowed to
modify them. Free the copies after creating the new pathname string.

Implement suggestion by jhb@ to have _PATH_FIRMWARE instead of hard
coding it to be "/usr/share/firmware".

Just install ar5523.bin into /usr/share/firmware and stop compiling it
in.

Differential Review: https://reviews.freebsd.org/D5639

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.

Add uath(4) wireless USB driver for Atheros AR5005UG and AR5005UX
chipsets.

Reviewed by: sam