tcp_wrappers: silence a few warnings

Mostly -Wdeprecated-non-prototype.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D43531

tcp_wrappers: Use ANSI (c89) function definitions

Although this code is in contrib/ there is no active upstream.

Reviewed by: brooks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36047

Use ANSI C function definitions and declerations.

Obtained from: CheriBSD
MFC after: 1 week
Sponsored by: DARPA, AFRL

Quiesce two warnings:

1. define the CODE * as const
2. restructure function to eliminate warning about exiting with no return.
severity_map() never returns when it can't find an appropriate sysylog
facility, and it longjmp()'s away into error code handling. Keep this
behavior by stashing the facility value found during our search and
checking for -1 if found.

Quiesce warnings by updating headerfile includes

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.

Make tcpwrappers use the magic in syslog.h for getting syslog facility
and level names.

Add FreeBSD tag.

PR: 24218
Approved by: markm

Clean import of TCP-wrappers by Wietse Venema.
Rest of build to follow.