usr.bin: 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

usr.bin: 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

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

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

mail(1): Bring some fixes from other BSDs.

- Use varargs properly
- Use pid_t
- Better handling of error conditions on forked jobs.
- Some prototype and warning cleanups.

Obtained from: NetBSD (some originaly from OpenBSD)

Always return either a dynamically allocated string or NULL from
expand(). Never return the name parameter, which could be a the buf[]
buffer which is allocated on the stack by getdeadletter() and which
would then be used after getdeadletter() has returned.

Reported by: Coverity
CID: 1199383
MFC after: 1 week

Add __unused. Ansi prototypes.

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

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.

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

Consistently use FBSDID

Add (unsigned char) cast to ctype macros
ftell->ftello, fseek->fseeko
File 'newsize' type int->off_t
Add visible (long) cast to fsize() when it called to small one message file and
result is assigned to long.

Sync with most of NetBSD's changes, including:

*) Sync with 4.4BSD-Lite2
*) Set usecs for utimes()
*) Add 'inc' command and 'autoinc' option that check for new mail
manually and automatically, respectively
*) Use POSIX signal handling and tty semantics
*) Handle long lines correctly when paging messages
*) Add ability to explicitly search 'To:' line
*) Various manpage cleanups
*) Support overriding '~/.mailrc' with $MAILRC
*) Support 'askbcc' and 'asksub' options
*) Fix various bugs

Reviewed by: ru (mail.1)
Obtained from: NetBSD

File positions are off_t nowdays, not long, so:
fseek -> fseeko
ftell -> ftello

NOTE: fseek/ftell 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.

[EOVERFLOW] For ftell ( ), the current file offset cannot be represented
correctly in an object of type long.

Handle snprintf() returning -1.

MFC after: 2 weeks

Removed duplicate VCS ID tags, as per style(9).

Cleanup mail(1)'s varying styles by converting to using style(9).

Also take a stab at cleaning up BDECFLAGS and convert all uses of
NOSTR, NIL, NONE, NOVAR, NOGRP, NOGE to NULL. Also kill 'register' to
get diffs somewhat closer to OpenBSD/NetBSD.

There are no functional changes however.
Reviewed by: nra (visual inspection)

Allow mail(1) to be able to read Eudora mailboxes by transforming
lines that end in <CR><LF> to just <LF>.

Reviewed by: imp
Obtained from: OpenBSD

Merge various changes from OpenBSD and NetBSD.

o remove panic() in favor of err(3) and use err(3) functions
consistently throughout
o use stat(2)'s S_IS* macros rather than S_IF*
o [r]index -> str[r]chr
o convert some static buffers to dynamic ones
o use real tempfiles rather than reopening the same templates
o rename some functions that clash with libc
o convert wait_status from union to int and use wait(2) status macros
o fix multiple potential buffer overflows
o fix a few comments
o add $FreeBSD$

Reviewed by: nra, nectar (earlier version)

Add $FreeBSD$

Rename local offsetof() macro to boffsetof() to avoid clashing with
the offsetof() from <stddef.h>

Use err(3).

BSD 4.4 Lite Usr.bin Sources