Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

gzip: Add support for decompressing zstd files.

Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D37236

Correct documentation year.

MFC after: 2 weeks

Port NetBSD improvements:

- Add -l support for xz files
- Add lzip support to gzip based on the example lzip decoder.

Obtained from: NetBSD
MFC after: 2 weeks
Relnotes: yes

Support SIGINFO.

Obtained from: NetBSD
MFC after: 2 weeks

Update NetBSD RCS IDs to reflect the changes being upstreamed.

MFC after: 13 days
X-MFC-With: r290024

In gunzip(1), treat trailing garbage as a warning and not an error. This
allows scripts to distinguish it between real fatal errors, for instance a
CRC mismatch.

Update manual page for the behavior change.

PR: bin/203873
Submitted by: Eugene Grosbein <eugen grosbein net>
MFC after: 2 weeks

Sync with NetBSD:

- Mention xz(1) in gzip(1).
- Strip away path from header name when decompressing.

MFC after: 2 weeks

Sync with NetBSD.

MFC after: 2 weeks

use .Mt to mark up email addresses consistently (part3)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

Incorporate recent changes from NetBSD. Most notable change is the addition
of support of decompressing xz files.

Obtained from: NetBSD

Match symbolic link handling behavior with GNU gzip, bzip2 and xz:

When we are operating on a symbolic link pointing to an existing
file, bail out by default, but go ahead if -f is specified.

Submitted by: arundel
MFC after: 2 weeks

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

MFC r207247,r207283,207284:

- Add a signal handler for SIGINT which removes output file when necessary.
- While I'm there, move unlink_input() slightly down to after closing the
output file, in uncompression path.
- Language improvements to make the BUGS section easier to read.

Language improvements to make the BUGS section easier to read.

Reviewed by: Alexander Best <alexbestms wwu de>
MFC after: 13 days

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.

Sync with NetBSD:
- gzip -n does not store timestamp; [1]
- Reduce diff against NetBSD by moving some casts in our local
versions.

PR: bin/134955
Obtained from: NetBSD
MFC after: 1 month

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

Sync with NetBSD's license changes.

Make it clear that gzcat expects each argument to be separate files.

PR: docs/123010
Submitted by: Andrew Wright <andrewhw ieee org>
MFC after: 2 weeks

Mention 'k' option of gunzip.

Pointed out by: ighighi gmail.com

Add a '-k' flag which is similar with its bzip2(1) counterpart,
meaning that the user wants the input file to be left intact.

Feature request: Ighighi <ighighi gmail.com>
PR: bin/103006
MFC after: 1 month

Mention a limitation that was inherted from RFC1952, making
it impossible to obtain correct file size from a file that
is larger than 4GB before compression.

PR: bin/110329
MFC after: 1 week

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)