libexec: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

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

More -Wmissing-variable-declarations fixes.

In addition to adding missing `static' keywords:
- bin/dd: Pull in `extern.h' to guarantee consistency with source file.
- libexec/rpc.rusersd: Move shared globals into an extern.h.
- libexec/talkd: Move `debug' and `hostname' into extern.h.
- usr.bin/cksum: Put counters in extern.h, as they are used by ckdist/mtree.
- usr.bin/m4: Move `end_result' into extern.h.
- usr.sbin/services_mkdb: Move shared globals into an extern.h.

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

Remove unneeded use of struct timezone.

We can safely call gettimeofday() without passing a struct timezone.
We're not using it at all.

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.

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

Fix some "in in" typos in comments.

PR: 121490
Submitted by: Anatoly Borodin <anatoly.borodin@gmail.com>
Approved by: rwatson (mentor), jkoshy
MFC after: 3 days

MFp4 @27667: WARNS=5 cleanup on i386.
Remove the unused FILE\ *tf from print_mesg args, and the
bogus passing in of an uninitialised FILE* for it.

Call a timeval 'now' instead of 'clock' due to shadowing.

Remove a nested localtime declaration.

Make the delete invite argument match the ID type, u_int32_t.

Use const for pointers to const items.

Cast to long where printing as such.

Include netinet/in.h for htonl/htons.

Reviewed by: imp

o Move externs to extern.h
o Use new-style prototypes exclusively rather than the old foo() style.
o Use new-style function definitions.
o remove register
o make functions passed to signal have the right signature.
o do minor const poisoning.

Include ttymsg.h from ../../usr.bin/wall instead of rolling our own
prototype.

Print the month number properly

MFC after: 1 week

In the "Message from Talk_Daemon" announcement, print the date as well
as the current time. It's nice to know whether the talk request you
see was sent just a few minutes ago (assuming you didn't hear the
bell), or if it's been decaying for days (weeks?).

$Id$ -> $FreeBSD$

Don't assume that time_t is long.

Use err(3). Add protos for -Wall.

Import Lite2's src/libexec, except for makekey (which was spammed
by a repository copy from 1.1.5 and patched back to Lite1) and
rbootd/bootdir/SYSHPBSD (which is binary). All changed files have
already left the vendor branch.

Revert $FreeBSD$ to $Id$

Fix buffer overrun problem.

Cannidate for: 2.2 [must]

Obtained from: Lite/2 and BSDI's published patch

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 $Id$

zap #include <sgtty.h>, it's not used.

Remove trailing whitespace.

Reviewed by: phk
changed ^G to \007

BSD 4.4 Lite Libexec Sources