Remove copyright strings ifdef'd out

We've ifdef'd out the copyright strings for some time now. Go ahead and
remove the ifdefs. Plus whatever other detritis was left over from other
recent removals. These copyright strings are present in the comments and
are largely from CSRG's attempt at adding their copyright to every
binary file (which modern interpretations of the license doesn't
require).

Sponsored by: Netflix

libexec: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Purge more stray embedded $FreeBSD$ strings

These do not use __FBSDID but instead use bare char arrays.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D41957

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

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.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Remove the 3rd clause ("advertising clause") of the BSD license as
permitted by the University of Berkeley on July 22, 1999.

Reviewed by: imp
MFC after: 1 week

Make comsat(8) approximately 15% smaller.

This program only consists of a single C file, so simply mark everything
except main() static.

Remove a gratuitous newline. This should be a non-functional change.

PR: bin/153667
Submitted by: Craig Leres
MFC after: 1 week

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.

Port comsat to utmpx.

It seems comsat stats the utmpx database each 15 seconds to see whether
it has been changed. I am changing this behaviour to look at the utmpx
database upon processing. I don't want to allow direct interference with
the database files. I also wonder whether this optimization has any
measurable performance benefit nowadays.

Fix several warnings.

- Add __unused keywords.
- Don't shadow a global variable called cr.
- Make the global cr variable const.

Fix handling of pts(4) device names in comsat(8). Also catch fork() errors.

Pseudo-terminals allocated with posix_openpt(2) will have more slashes
in their path names than comsat(8) allows, so allow slashes when the
character device name starts with "pts/".

This patch is loosely based on NetBSD's changes, revision 1.33. Because
it also included the changes to fork(), I imported them here as well.
Maybe we could import even more fixes from the other BSD's?

Original commit message from the NetBSD folks:

PR/30170: Markus W Kilbinger: src/libexec/comsat complains
about: '/' in "/dev/pts/1"

Reported by: Robert Huff <roberthuff rcn com>

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

Fix most cases where the address of an int is passed to a function expecting a
socklen_t * argument.

Add ability to only beep when mail arrives.

comsat:
only send two bell charecters if S_IXGRP is set and S_IXUSR is not.

biff:
add new option 'b' to set S_IXGRP.

PR: 10931
Submitted by: Andrew J. Korty <ajk@purdue.edu>
Approved by: sheldonh (mentor)
MFC after: 1 month

o Eliminate __P
o Use new-style function definitions
o remove some !__STDC__ code
o eliminate register

File positions are off_t nowdays, not long, so:
atoi -> strtoll
fseek -> fseeko

NOTE: that fseek not works for >long offsets per POSIX:

[EOVERFLOW] For fseek( ), the resulting file offset would be a value which
cannot be represented correctly in an object of type long.

Fix minor cast too.

$Id$ -> $FreeBSD$

Fixed printf format errors.

Use err(3). exit(-1) -> exit(1).

Allow backspace too

disable upper controls and enable all other
8bit codes due to lack of locale knowledge in daemon

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

add forgotten $Id$

wrong C bracketing, *blush*...

Another sgtty use bites the dust..

Pass in both username and file to jkfprintf

Extend message format to user@offset[:file]
Obtained from: FreeBSD 1.x

BSD 4.4 Lite Libexec Sources