Update gstreamer1 to upstream release 1.20.3

PR:		261585
Reviewed by:	riggs,jbeich,tcberner

Differential Revision:	https://reviews.freebsd.org/D36850

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.

multimedia: remove 'Created by' lines

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

  *  Aaron LI <aly@aaronly.me>
  *  Alexander Botero-Lowry <alexbl@FreeBSD.org>
  *  Alexander Logvinov <ports@logvinov.com>
  *  Alexey Dokuchaev <danfe@FreeBSD.org>
  *  Anders Nordby <anders@FreeBSD.org>
  *  Andrew Pantyukhin <infofarmer@FreeBSD.org>
  *  Andrew Thompson <andy@fud.org.nz>
  *  Andrew Thompson <thompsa@FreeBSD.org>
  *  Angel Carpintero <ack@telefonica.net>
  *  Anish Mistry (with help from mean)
  *  Anonymous <swell.k@gmail.com>

framework: convert bsd.gstreamer.mk to Uses/gstreamer.mk

- convert bsd.gstreamer.mk to Uses/gstreamer.mk
- convert ports tree to make use of USES=gstreamer
- remove duplicate dependency lines from the tree

Differential Revision: https://reviews.freebsd.org/D35097

Remove # $FreeBSD$ from Makefiles.

multimedia/gstreamer1-transcoder: add DOCS option

PR:		236290
Submitted by:	rozhuk.im@gmail.com

Update gstreamer1 to 1.16.2.

- The spc plugin was removed inflavor for the gsm plugin.
- Added in tree qt plugin.

Changelog: https://gstreamer.freedesktop.org/releases/1.16/#1.16.2

Update net-im/fractal to 4.2.2 to support GStreamer 1.16 (approved by
maintainer)

Thanks to antoine@ for the exp-run.

PR:		239386

Prepare for powerpc-on-clang by deleting hard-coded tests for libstdc++.so
as a stand-in for "are we running on gcc".

For people already testing powerpc on clang, it is possible that they
already have both compilers in base.  Thus, the assumption that "gcc is
in base" (e.g.  libstdc++.so exists) always means "force use of GCC" is
already broken.  It will be for everyone on -CURRENT once the switch is
made.

While here, standardize on compiler:c++11-lang instead of -lib (they are
equivalent these days), pet portlint, and do some other cleanup.

Approved by:	portmgr (tier-2 blanket)

Base GCC doesn't support -Wno-pedantic, so remove it to fix build on
GCC-based architectures.

PR:		234052
Submitted by:	Piotr Kubaj
Approved by:	portmgr (tier-2 blanket)

Add gstreamer1-transcoder

Transcodes a stream defined by its first <input-uri> argument to the place
defined by its second <output-uri> argument into the format described in its
third <encoding-format> argument or using the given <output-uri> file extension.

Submitted by:		woodsb02@
Differential Revision:	https://reviews.freebsd.org/D17042