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

sbin: 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.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

Fix some more warnings found by clang.

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.

Allow mknod(8) to be only invoked with a pathname as an argument.

In 99% of the cases people just want to recreate device nodes they
removed from /dev. There is no reason to pass the additional "c 0 0"
anymore.

Also slightly improve the manpage. Remove references to non-existent
device names and platforms.

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

In the previous changeset a cast of myminor to u_int were
removed, which will cause problems on architectures where
longs are longer than ints, for instance,
"mknod foo c 0 0xffff00ff"
would fail in such cases.

Use a proper cast instead.

Prompted by: bde

WARNS=6

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core, imp

Add chown(8)-like functionality. This will allow us to not use chown(8)
in MAKEDEV(8) -- removing the need of having /usr mounted.

Cast myminor/mymajor results to u_int so
comparisons to longs work correctly on
alpha.

$Id$ -> $FreeBSD$

Fix mknod which overloaded a little too much on "minor" and "major"

Remove unused #include. Add usage().

Use err(3).

Fixed checking for a non-numeric minor number.

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.

Use strtoul() more carefully.

Check that the major and minor are valid.

Don't print `.' at the end of error messages.

Fixed all warnings from "cc -Wall".

Finally use strtoul() to convert the major an minor numbers, so
proper error-checking can be done, and octal and hexadecimal
numbers are allowed.

BSD 4.4 Lite sbin Sources

Note: XNSrouted and routed NOT imported here, they shall be imported with
usr.sbin.