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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

libc: 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.

ulimit(3): simplify.

rlim_t is at least as large as long, so we don't need the
extra variable to keep the intermediate step. We don't
need the volatile either.

The code was tested on i386 and amd64.

Suggested by: bde
X-MFC with: r278803

ulimit(3): Fix broken check.

The existing implementation had a broken comparison that could
overflow and return confusing values. Replace this with a check
that avoids the overflow before it happens.

Consistently return a maximum value also on the case of negative
arguments since negative is considered an overflow and means
infinity for our current setrlimit().

New revamped version is credited to Bruce Evans.

CID: 1199295
MFC after: 1 week

Revert 278634: This broke the build due to the compiler being too clever.

Will be back, with proper compiler workarounds.

ulimit(3): Fix broken check.

The existing implementation had a broken comparison that could overflow.
Replace this with a check that avoids the overflow before it happens.

Consistently return a maximum value also on the case of negative
arguments since negative is considered an overflow and means
infinity for our current setrlimit().

Discussed with: bde (rather extensively)

CID: 1199295
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.

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

Rename UL_GETSIZE to UL_GETFSIZE and UL_SETSIZE to UL_SETFSIZE; these are
the names required by 1003.1-2001. The old names are retained for
source compatibility with FreeBSD 5.0 and will be removed before 6.0.

Remove unused variable: size.

Implement POSIX.1-2001 (XSI)'s ulimit(3).

Submitted by: Kyle Martin <mkm@ieee.org>