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 sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

factor: support OpenSSL 3

This change ports the BN APIs to an OpenSSL 3 compatible set of APIs.

This removes the need for requesting OpenSSL 1.1 compatible APIs.

MFC after: 1 week
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D40298

Add simple factor/primes regression tests

This will help ensure that the change following this
one to support OpenSSL 3 is sane.

MFC after: 1 week
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D40297

factor: Request the OpenSSL 1.1 API

OPENSSL_API_COMPAT can be used to specify the OpenSSL API version in
use for the purpose of hiding deprecated interfaces and enabling
the appropriate deprecation notices.

This change is a NFC while we're still using OpenSSL 1.1.1 but will
avoid deprecation warnings upon the switch to OpenSSL 3.0.

A future change should migrate to use the OpenSSL 3.0 APIs.

PR: 271615
Reviewed by: emaste
Event: Kitchener-Waterloo Hackathon 202305
Sponsored by: The FreeBSD Foundation

Adopt SRCTOP in usr.bin

Prefer ${SRCTOP}/foo over ${.CURDIR}/../../foo and ${SRCTOP}/usr.bin/foo
over ${.CURDIR}/../foo for paths in Makefiles.

Differential Revision: https://reviews.freebsd.org/D9932
Sponsored by: Netflix
Silence on: arch@ (twice)

Fix LDADD/DPADD that should be LIBADD.

Sponsored by: EMC / Isilon Storage Division

Final step of eliminating the "games" distribution: Merge src/games
(or what's left of it, at least) into src/usr.bin.

This change will not be MFCed.

Discussed at: EuroBSDCon 2014
Committed from: EuroBSDCon 2015