Remove $FreeBSD$: one-line .c pattern

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

dc: make use of caph_enter

We already use caph library so this makes sense.

dc(1): Merge minor changes from OpenBSD.

Prefer setvbuf() to setlinebuf() for portability.
Some style(9) and redundant tests for NULL.

These are only meant to ease up merging newer changes but we are skipping
changes done in order to accomodate OpenBSD's pledge support.

Obtained from: OpenBSD
MFC after: 2 weeks

Capsicumize some trivial stdio programs

Trivially capsicumize some simple programs that just interact with
stdio. This list of programs uses 'pledge("stdio")' in OpenBSD.

No objection from: allanjude, emaste, oshogbo
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D8307

Properly handle '-h' argument.

PR: 176332
Reviewed by: scottl
MFC after: 3 days

Add missing static keywords to dc(1)

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

- Fix style(9)

Submitted by: ed
Approved by: delphij (mentor)

- Fig segmentation fault

Submitted by: Hizel Ildar <hizel@vyborg.ru> (via current@)

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.

- style(9)

Approved by: delphij (mentor)

- Remove dead variable assignments
- Fix -x

Submitted by: uqs
Approved by: delphij (mentor)

Replace GNU bc/dc with BSDL versions ported from OpenBSD. They have a good
compatibility level with the GNU counterparts and have shown to be mature
enough. For now, the GNU versions aren't removed from the tree, just detached
from the build.

Sponsored by: Google Summer of Code 2008
Portbuild run by: erwin
Approved by: delphij