Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

spdx: The BSD-2-Clause-NetBSD identifier is obsolete, drop -NetBSD

The SPDX folks have obsoleted the BSD-2-Clause-NetBSD 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.

Import the binutils-2_17-branch from the sourceware CVS repository,
exactly as it was on Tue, 7 Aug 2007 00:00:13 +0000.

Corresponds to git commit b458c361f01f7a257f897d0961d0a379ee999aaa.

This is currently (and most likely forever :) the last commit on this
branch.

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.

Remove NetBSD Foundation clauses 3 & 4. They eliminated those clauses
last year.

Flatten vendor/binutils/dist.

Flatten the dist tree.

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

Reorganize the gcc vendor import work area. This flattens out a bunch
of unnecessary path components that are relics of cvs2svn.

(These are directory moves)

Add getopt_long_only()

In the comment tell about optreset extension for NetBSD ghetopt_long()

Add optreset to getopt.h too since NetBSD getopt_long() (but not GNU one)
use it too.

Try to better mimic GNU getopt.h which does not assume to make visible
all unistd.h functions, use _GETOPT_DECLARE define for that.

Fix comment: GNU getopt.h to which this header tries to mimic does not declare
getsubopt/optreset

Add getopt_long(3).

Obtained from: NetBSD
Sponsored by: Apple