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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

include: General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified 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.

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.

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

No need to support UL_GETSIZE and UL_SETSIZE anymore; they are about to be
renamed in RELENG_5_0.

Rename UL_GETSIZE to UL_GETFSIZE and UL_SETSIZE to UL_SETFSIZE; these are
the names required by 1003.1-2001. The old names are retained for
source compatibility with FreeBSD 5.0 and will be removed before 6.0.

Bracket the prototype for ulimit() with __BEGIN_DECLS/__END_DECLS
so that it can be called from C++.

Implement POSIX.1-2001 (XSI)'s ulimit(3).

Submitted by: Kyle Martin <mkm@ieee.org>