One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

net/openmdns: drop maintainership

Simplify port-specific manpages location after r523104

Not all of my ports are covered because:
- USES=cmake requires patching devel/cmake to undo BSD-specific defaults
  (A good example why BSD quirks should stay in ports, not to be upstreamed)
- USES=meson and GNU_CONFIGURE require dropping --mandir argument
- ponscripter-sekai requires Templates/BSD.local.dist to NOT create PREFIX/man

Fix build with src r354909 applied.

The referenced change made NO_INSTALLLIB, NO_MAN, and NO_PROFILE into
errors causing these ports that declare them and use the FreeBSD make
infrastructure as part of their build to fail.

When the offending variables occur in a BSD Makefile, NO_MAN becomes
MAN= and NO_INSTALLLIB and NO_PROFILE become MK_INSTALLLIB=no and
MK_PROFILE=no respectively.  When declared in the environment they
become WITHOUT_<FOO>.

The output of tools like awk, date, sort, tr,... depends on the current
locale set by the user.  Add LANG=C and LC_ALL=C at the beginning of
bsd.port.mk and export them so all commands are executed with the C locale.
LC_ALL=C overrides all other LC_* variables.  LANG is used by setlocale(3)
as default value for LC_* variables, so normally it isn't used when LC_ALL
is set, but there's code out there that looks at LANG directly so it's safer
to set it as well.  The only commands not captured by this are !=
assignments before any inclusion of bsd.port.*mk.

Introduce USE_LOCALE=<locale> that adds LANG=<locale> and LC_ALL=<locale> to
CONFIGURE_ENV and MAKE_ENV so upstream build systems can be executed with a
different locale (e.g. USE_LOCALE=en_US.UTF-8).

PR:		215882
Exp-run by:	antoine
Approved by:	portmgr (antoine)

devel/libopenbsd, games/openbor: unbreak BOOTSTRAP build

$ make clean all BOOTSTRAP= -C devel/libopenbsd
===>  Cleaning for libopenbsd-r298107
===>  License ISCL accepted by the user
===>   libopenbsd-r298107 depends on file: /usr/local/sbin/pkg - found
===>   libopenbsd-r298107 depends on executable: svn - found
/bin/mkdir -p /usr/ports/devel/libopenbsd/work
svn export -r298107 https://svn.freebsd.org/base/head/lib/libopenbsd/
/usr/ports/devel/libopenbsd/work/libopenbsd-r298107
A    work/libopenbsd-r298107
A    work/libopenbsd-r298107/sys
A    work/libopenbsd-r298107/Makefile
A    work/libopenbsd-r298107/imsg.c
A    work/libopenbsd-r298107/sys/sysctl.h
A    work/libopenbsd-r298107/getdtablecount.c

devel/libopenbsd: add new port

libopenbsd is a thin compatibility layer intended to allow a limited set of
OpenBSD software to compile on other BSDs with little or no modification.