Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

include: General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

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.

Make strfmon_l() work without requiring the use of <xlocale.h>.

The strfmon_l() function provided by <xlocale/_monetary.h> is also part
of POSIX 2008's <monetary.h>, so it should be exposed by default.

Change the check used in <monetary.h> to be similar to the one that's
part of <wchar.h>, where we both test for __POSIX_VISIBLE and
_XLOCALE_H_.

Correctly expose xlocale functions if people include the headers in the wrong
order (as some ports apparently do).

Approved by: dim (mentor)

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.

Fix an error which prevented ssize_t from becoming defined. Add
restrict type-qualifier.

o Merge <machine/ansi.h> and <machine/types.h> into a new header
called <machine/_types.h>.
o <machine/ansi.h> will continue to live so it can define MD clock
macros, which are only MD because of gratuitous differences between
architectures.
o Change all headers to make use of this. This mainly involves
changing:
#ifdef _BSD_FOO_T_
typedef _BSD_FOO_T_ foo_t;
#undef _BSD_FOO_T_
#endif
to:
#ifndef _FOO_T_DECLARED
typedef __foo_t foo_t;
#define _FOO_T_DECLARED
#endif

Concept by: bde
Reviewed by: jake, obrien

* style(9)'ify
* add K&R support to langinfo.h

Requested by: bde (2)

Add my e-mail to copyrights

Fixed some style bugs.

Fixed namespace pollution:
- only declare the application symbols specified in Posix.1-200x drafts,
not everything in <sys/types.h> and <stddef.h>.
- don't use the application symbol 'm' for an arg name.

add monetary.h as per POSIX requirement