Remove $FreeBSD$: one-line .h pattern

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

usr.bin/patch: remove unneeded header.

MFC after: 2 weeks

patch(1): Add -Vnone option to disable backup files

Differential Revision: https://reviews.freebsd.org/D3146
Reviewed by: pfg
Approved by: markj (mentor)
MFC after: 1 week
Relnotes: yes
Sponsored by: EMC / Isilon Storage Division

- Refresh code with latest OpenBSD revisions.
- Remove $DragonFly$ tags as they are using git nowadays and VCS tags will
not help merging.
- Other changes to Copyright headers to make them consistent with other
source code, we intend to fork from this point.

Reviewed by: pfg

- Add a BSD-licensed patch, ported by Pedro F. Giffuni (pfg) from
DragonflyBSD and install it as bsdpatch. WITH_BSD_PATCH makes it
default and installs GNU patch as gnupatch.

Submitted by: pfg
Obtained from: The DragonflyBSD Project

Remove these three files left-over from my unsuccessful attempt to
re-import `patch' into this location. Instead I think I will import
it to 'patch-b', and that way I can be sure that I am starting with
a clean slate WRT the CVS repository.

Import of a BSD-licensed version of `patch', which will eventually
replace the version we currently have in src/gnu/usr.bin/patch/.
Among other things, this version includes a --posix option for strict
POSIX conformance.

This version is the current source from OpenBSD as of today. It is
their 3.5-release, plus a few updates to patch.c and pch.c that they
made about three weeks ago.