*/*: Properly depend on Subversion LTS or latest with WITH_SUBVERSION_VER

When LTS version of Subversion is set in make.conf (WITH_SUBVERSION_VER)
depending ports will still depend on latest version (devel/subversion)
instead of LTS one (devel/subversion-lts). This will cause dependency
conflicts when packages are distributed with Poudriere, namely pkg(8)
will report them and fail to install.
Make all affected ports properly depend on the right port based on the
value set in WITH_SUBVERSION_VER.

Approved by:	jrm (mentor), otis (mentor), lev (maintainer timeout)
Differential Revision:	https://reviews.freebsd.org/D43864

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.