databases/p5-DBD-mysql: Fix for MariaDB users

Add a new variable DBD_MYSQL, use that in *_DEPENDS and add mysql to USES
where required. DBD_MYSQL will automatically set the correct DBD dependency.

In cd16748194e2 databases/p5-DBD-mysql was updated to 5.x, in 5.x the
support for MariaDB was removed and only MySQL >= 8.0 is supported.

In the 4.x releases MariaDB is still supported, according to upstream 4.x
will still be supported for a while [1], so use that for now when we detect
that MYSQL_FLAVOUR is set to mariadb. databases/p5-DBD-mysql4 was added in
d95f49cb3b54.

DBD:MariaDB would be another alternative, but migrating to it might need
more analysis than just staying with the 4.x releases of p5-DBD-mysql. This

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

mail: remove 'Created by' lines

A big Thank You to the original contributors of these ports:

  *  <ashish@FreeBSD.org>
  *  Aaron Dalton <aaron@FreeBSD.org>
  *  Adam David <adam@FreeBSD.org>
  *  Adam McDougall <mcdouga9@egr.msu.edu>
  *  Adam Weinberger <adamw@FreeBSD.org>
  *  Ade Lovett <ade@FreeBSD.org>
  *  Akinori MUSHA aka knu <knu@idaemons.org>
  *  Alex Deiter <tiamat@komi.mts.ru>
  *  Alex Dupre <ale@FreeBSD.org>
  *  Alex Dupre <sysadmin@alexdupre.com>
  *  Alex Perel <veers@disturbed.net>

Cleanup: for ports under m* categories, drop redundant GH_{ACCOUNT,PROJECT}.

Remove # $FreeBSD$ from Makefiles.

onvert to UCL & cleanup pkg-message (categories l-m)

mail/ratelimit-policyd: Update to 1.0.4

PR:		237209
Submitted by:	Miroslav Lachman <000.fbsd@quip.cz> (maintainer)

mail/ratelimit-policyd: update 1.0.1 -> 1.0.3

PR:		236501
Submitted by:	Miroslav Lachman <000.fbsd@quip.cz> (maintainer)
Relnotes:	https://github.com/MirLach/ratelimit-policyd/releases

Remove MASTER_SITES=GH when it is the only one.

It is added by USE_GITHUB.  Tested with `make makesum` not changing distinfo.

Add DOCS options to ports that should have one.

Also various fixes related to said option.

PR:		230864
Submitted by:	mat
exp-runs by:	antoine

Add new port mail/ratelimit-policyd.

This rearranges a few things in the Makefile, such as reordering
of USES= and USE... options, and uses PORTDOCS for README.md.

I have also revised pkg-message.in and pkg-descr for grammar
and consistency (trailing colons) and added a "postfix reload" line.

PR:		226795
Submitted by:	Miroslav Lachman