emulators/qemu-powernv: Fix build on armv7

PR:		268225

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.

textproc/libxml2: bump all LIB_DEPENDS consumers

This is a separate commit to facilitate easier cherry-picking for
quarterly.

PR: 262853, 262940, 262877, 263126
Approved by: fluffy (mentor)

textproc/libxml2: bump all dependencies

This should make sure that all dependent ports will pick
up the new version commited with a13ec21cd733f67a9fc0dc00ab45268bdc236246

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

Remove # $FreeBSD$ from Makefiles.

Mark as BROKEN on riscv64:

  qemu-powernv-3.0.50_2.log:ERROR: Unsupported CPU = riscv, try
--enable-tcg-interpreter

Approved by:	portmgr (tier-2 blanket)
Obtained from:	lonesome.com build testing

emulators/qemu-powernv: fix build with lld 10

Apply db@'s variant from r528777 to fix lld 10 build issues with qemu ports.
While here fix a port QA issue by adding libxml2 to USE_GNOME.

Approved by:	timur (mentor)
Sponsored by:	BBOX.io
Differential Revision:	https://reviews.freebsd.org/D24390

qemu ports: drop python version restriction from remaining qemu ports

ports r518822 dropped the version restriction from the new
qemu-user-static-devel port, follow suit and drop it from the remaining
qemu-* ports that don't actually specifically depend on python2.7 -- qemu
has supported python >= 3 since sometime in the 2.x series, and all of these
ports surpass the mark.

PORTREVISION is bumped by recommendation of koobs for people holding
python2.7 simply because these ports required it.

Q/A
 *  testport: looks good

Approved by:	koobs (ports)
Approved by:	portmgr (blanket: ports/framework (python) compliance)
MFH:		2019Q4

Add USES=xorg USES=gl, ports categories e

Add USES=xorg, USES=gl and in a few cases USES=gnome to ports in categories
starting with 'e'.

Add compiler:c11 to USES to fix build on GCC-based systems.

Tested on: amd64, powerpc64.

Approved by:	portmgr (tier-2 blanket)

Update snapshot and fix fetch.  The previous distinfo was populated
from a makesum using a cached sha256 from freefall.freebsd.org.

The updated snapshot includes PHB4 support and various bugfixes.

While here, pet portlint.

Submitted by:		maintainer
Differential Revision:	https://reviews.freebsd.org/D18654

Mark BROKEN: unfetchable

Reported by:	pkg-fallout

emulators/qemu-powernv: rename from emulators/qemu-ppcnv and update to POWER9

Update to benh's qemu power9 branch which adds support for features like radix
mmu and phb.

Take maintainership of this port with Mark's permission from IRC conversation.

Approved by:	krion (mentor)
Sponsored by:	BBOX.io
Differential Revision:	https://reviews.freebsd.org/D17862