emulators/linux-c7: Unbreak INDEX.

Fixes:	a0c9796c46e20838fd4b366a8b5ae5d696853e09

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.

emulators: remove 'Created by' lines

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

  *  Akinori MUSHA aka knu <knu@idaemons.org>
  *  Alejandro Pulver <alejandro@varnet.biz>
  *  Alexander Best <arundel@gmx.net>
  *  Alexander Nedotsukov <bland@FreeBSD.org>
  *  Alexey Dokuchaev <danfe@FreeBSD.org>
  *  Alexey V. Antipovsky <kemm@in-line.ru>
  *  Alonso Cardenas Marquez <acm@FreeBSD.org>
  *  Brian Gaeke <brg@dgate.org>
  *  Danilo Egea Gondolfo <danilo@FreeBSD.org>
  *  David Naylor <naylor.b.david@gmail.com>
  *  David O'Brien (obrien@cs.ucdavis.edu)

Remove # $FreeBSD$ from Makefiles.

Update to CentOS 7.7.1908.

Put libdrm into a separate port so it can be kept at the CentOS 7.6 version.
The new version fails to detect graphics hardware on FreeBSD.

Move security/linux-c7-openssl into emulators/linux_base-c7.  It is needed
by sha*sum from the coreutils package.

On amd64 adding DEFAULT_VERSIONS+=linux=c6 to /etc/make.conf made Linux
infrastructure ports (linux_base-c6 and linux-c6*) install i386 CentOS 6
packages.  Using c6_64 instead of c6 made them install mixed amd64/i386
CentOS 6 packages and allowed Linux application ports to install amd64
binaries when available.  The i386-only configuration was only useful for
users of x11/nvidia-driver* which didn't provide Linux amd64 emulation
until recently.

With x11/nvidia-driver* now supporting Linux amd64 there's no longer a
need for i386-only Linux on amd64.  Let DEFAULT_VERSIONS+=linux=c6 make
Linux infrastructure ports install mixed amd64/i386 CentOS 6 packages,
like c6_64 before, and remove support for c6_64 as a value.

Replace LINUX_ARCH with ARCH everywhere because they are always the same
now.

Update CentOS 7 ports to 7.6.1810.

This adds some new ports:
converters/linux-c7-fribidi required by x11-toolkits/linux-c7-pango.
graphics/linux-c7-libglvnd required by graphics/linux-c7-dri.
graphics/linux-c7-wayland required by graphics/linux-c7-dri.
print/linux-c7-freetype unbundled from emulators/linux_base-c7 because it
depends on graphics/linux-c7-png now.

Mesa OpenGL libraries in graphics/linux-c7-dri now support libglvnd (GL
Vendor-Neutral Dispatch library) which allows some applications to use
Mesa while others use Nvidia OpenGL.  The x11/nvidia-driver* ports have
been changed so versions above 390.42 now use CentOS libglvnd and no longer
install a bundled copy.

PR:		229431
Submitted by:	pkubaj (partly)

Merge Linux ncurses-base into linux_base.  It's needed by ncurses-libs.

Update Linux CentOS 7 ports to 7.4.1708.

- Autodetect the installed linux_base port and use LINUX_DEFAULT only as
  a last resort.
- Construct a list of DISTFILES for every architecture (amd64, i386).
  Select one list for regular make and all lists for make makesum so linux
  ports can have one combined distinfo file.
- Set DIST_SUBDIR?=centos so there's only one copy of common distfiles.
- Use MASTER_SITES and DISTFILES groups so make fetch is a bit smarter.
- Regenerate all distinfo files.
- For linux_base-c6 (just like linux_base-c7 already does) turn bin, lib,
  lib64 and sbin into symbolic links to the same directory under usr.
  This fixes the problem where some programs/libraries exist under / on
  FreeBSD and /usr on Linux or vice versa and then depending on the order
  of search paths Linux programs may run/load FreeBSD programs/libraries
  and fail.
- Turn usr/share/icons into a symbolic link to LOCALBASE/share/icons so

Update Linux CentOS 7 ports to 7.3.1611.  While 7.2 had semi-official i386
packages there are no such packages for 7.3 yet so i386 support has been
marked IGNORE for now.

Change DIST_SUBDIR to just "centos" so distfiles that remain the same
between major versions don't have to be redownloaded.

Remove fmake hacks from linux.mk.

Submitted by:	Piotr Kubaj <pkubaj@anongoth.pl>

Remove dependency on flash plugin.

Remove NVIDIA option from Linux ports now that the nvidia-driver can be
installed later.

Add Linux CentOS 7 infrastructure ports.

Mk/Uses/linux.mk changes:
- Add support for architecture neutral (noarch) distfiles.
- Add support for 64-bit only ports: set IGNORE on i386 and don't install
  32-bit compat libraries on amd64.

Submitted by:	Piotr Kubaj <pkubaj@anongoth.pl>
Differential Revision:	https://reviews.freebsd.org/D7886