Remove $FreeBSD$: two-line .h pattern

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spdx: The BSD-2-Clause-NetBSD identifier is obsolete, drop -NetBSD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

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.

Support SIGINFO.

Obtained from: NetBSD
MFC after: 2 weeks

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

MFC r206387:

Diff reduction against NetBSD and add myself to AUTHORS section of the
manual page as I wrote the unpack functionality. No actual executable
code change verified with md5(1).

Diff reduction against NetBSD and add myself to AUTHORS section of the
manual page as I wrote the unpack functionality. No actual executable
code change verified with md5(1).

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.

MFC r199066 + 199339:

Apply a NetBSD fix (revision 1.12) to handle multi-session bzip2 files
as created by pbzip2.

We should distinguish between a real truncated case and EOF after
BZ_STREAM_END triggered re-init. Do it by introducing a new flag
to represent the 'cold' case after bzip2 state is reinitialized.

This fixes regression reported on -current@ as well as another one
I found during twiddling with gzip.

Reported by: swell.k gmail.com
MFC after: 1 week

Apply a NetBSD fix (revision 1.12) to handle multi-session bzip2 files
as created by pbzip2.

Submitted by: mrg (NetBSD.org)
MFC after: 1 week

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

Remove clause 3 and 4 of NetBSD license.

Obtained from: NetBSD

Replace the GNU gzip with a slightly modified NetBSD gzip. The
NetBSD version is a feature-to-feature re-implementation of GNU
gzip using the freely-redistributable zlib and this version is
expected to be mostly bug-to-bug compatible with the GNU
implementation.

- Because this is a piece of mature code and we want to make
changes so it is added directly rather than importing to
src/contrib.
- Connect newly added code to src/usr.bin/ and rescue/rescue
build.
- Disconnect the GNU gzip code from build for now, they will
be eventually removed completely.
- Provide two new src.conf(5) knobs, WITHOUT_BZIP2_SUPPORT and
WITHOUT_BZIP2.

Tested by: kris (full exp-7 pointyhat build)
Approved by: core (importing a 4-clause BSD licensed file)
Approved by: re (adding new utility during -HEAD code slush)