multimedia/libgav1 0.20.0

multimedia/libgav1: upgrade to 0.20.0

*/*: Chase devel/abseil update

multimedia/libgav1: Improve port

* Use DEBIAN packaged source instead of unofficial repo
* Use upstream release archive for third party dependency
* Define LICENSE_FILE
* Build with c++17 instead of gnu17
* Fix install path of pkg-config file

multimedia/libgav1: drop maintainership

multimedia/libgav1: switch distfile mirror

Avoid having to maintain my own mirror. To find more use
https://github.com/search?q=libgav1&type=repositories&s=updated

Bump revisions of dependent ports after Abseil C++ libraries update

Requested by:	madpilot

multimedia/libgav1: update to 0.19.0

Changes:	https://chromium.googlesource.com/codecs/libgav1/+log/v0.18.0..v0.19.0
Reported by:	portscout

devel/abseil: Update to 20230125.3

- Bump PORTREVISION of dependent ports for shlib change
  some ports are skipped due to re2 shlib change

Changes:	https://github.com/abseil/abseil-cpp/releases
PR:		270233
Approved by:	danfe (maintainer)

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.

This commit implements such a proposal and moves one of the WWW: entries
of each pkg-descr file into the respective port's Makefile. A heuristic
attempts to identify the most relevant URL in case there is more than
one WWW: entry in some pkg-descr file. URLs that are not moved into the
Makefile are prefixed with "See also:" instead of "WWW:" in the pkg-descr
files in order to preserve them.

There are 1256 ports that had no WWW: entries in pkg-descr files. These
ports will not be touched in this commit.

The portlint port has been adjusted to expect a WWW entry in each port
Makefile, and to flag any remaining "WWW:" lines in pkg-descr files as
deprecated.

Approved by:		portmgr (tcberner)

multimedia/libgav1: update to 0.18.0

Changes:	https://chromium.googlesource.com/codecs/libgav1/+log/v0.17.0..v0.18.0
Reported by:	portscout

multimedia/libgav1: update to 0.17.0

Changes:	https://chromium.googlesource.com/codecs/libgav1/+log/v0.16.3..v0.17.0
Reported by:	portscout

multimedia/libgav1: update to 0.16.3

Changes:	https://chromium.googlesource.com/codecs/libgav1/+log/v0.16.0..v0.16.3
Reported by:	portscout

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

Remove # $FreeBSD$ from Makefiles.

multimedia/libgav1: Sync -std= with devel/abseil to match ABI

PR:		250376
Approved by:	jbeich

multimedia/libgav1: drop PORTSCOUT, it doesn't work

Requires testing PORTSCOUT rules locally.

multimedia/libgav1: try #2 to make portscout ignore N (init) tag

multimedia/libgav1: ignore empty tag, predating the first release

multimedia/libgav1: drop remnant from using bundled abseil

multimedia/libgav1: add new port

libgav1 is a Main profile (0) & High profile (1) compliant AV1 decoder.

https://chromium.googlesource.com/codecs/libgav1