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.

graphics/mesa-libs: Bump reverse deps for libglvnd

Per discussion with bapt on helping pkg handle the changing of these
deps and avoiding impossible upgrade senarios.

PR:		246767
Reviewed by:	manu, bapt
Approved by:	x11
Differential Revision:	https://reviews.freebsd.org/D30824

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

Remove # $FreeBSD$ from Makefiles.

Add USES=xorg USES=gl, ports categories m

Add USES=xorg and USES=gl to ports in categories starting with 'm'
While here, try to sprinkle other USES (mostly gnome and sdl) as needed.

Bump PORTREVISION for ports depending on the canonical version of GCC
as defined in Mk/bsd.default-versions.mk which has moved from GCC 8.3
to GCC 9.1 under most circumstances now after revision 507371.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, everything INDEX-11 shows with a dependency on lang/gcc9 now.

PR:		238330

Bump PORTREVISION for ports depending on the canonical version of GCC
defined via Mk/bsd.default-versions.mk which has moved from GCC 7.4 t
GCC 8.2 under most circumstances.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, as a double check, everything INDEX-11 showed depending on lang/gcc7.

PR:		231590

Fix build on gcc-based archs by updating USES.

Tested on powerpc64 and amd64 (for no regression).

While here, pet portlint.

Approved by:	portmgr (tier-2 blanket)

Fix build with clang 6.

- Update libva to 2.0.0
- Update libva-intel-driver to 2.0.0
- Update libva-utils to 2.0.0
- Bump dependent ports due to shlib bump
- Import upstream patch to fix multimedia/mpv [1]
- Import upstream patch to fix multimedia/gstreamer1-vaapi [2]

Approved by:	cpm [1], multimedia (timeout) [2]
Obtained
from:	https://github.com/mpv-player/mpv/commit/2ecf240b1cd20875991a5b18efafbe799864ff7f
[1]
		https://cgit.freedesktop.org/gstreamer/gstreamer-vaapi/commit/gst-libs/gst/vaapi/gstvaapiutils.c?id=777bba473e3ed1c7b8b7f7f0322892851c70dfd9
[2]
Differential Revision:	https://reviews.freebsd.org/D12761

Revision bump of all ports with USE_GL after consolidation of mesa-libs

Approved by:	swills (mentor)
Differential Revision:	https://reviews.freebsd.org/D10845

Mark some ports failing on power64.  In cases where the error message
was a stub, provide a real one.

While here, pet portlint.

Approved by:	portmgr (tier-2 blanket)
Reported by:	swills

The package provides a generic VDPAU driver. It uses OpenGL under the
hood to accelerate drawing, scaling, and (if available) VA-API to
accelerate video decoding.

WWW: https://github.com/i-rinat/libvdpau-va-gl

Differential Revision:	https://reviews.freebsd.org/D10055
Submitted by:		jbeich (Jan Beich)