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.

lang: remove 'Created by' lines

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

  *  Aaron Dalton <aaron@FreeBSD.org>
  *  Adam Weinberger <adamw@FreeBSD.org>
  *  Akinori MUSHA aka knu <knu@idaemons.org>
  *  Alex Dupre <ale@FreeBSD.org>
  *  Alexey Dokuchaev <danfe@FreeBSD.org>
  *  Alonso Cardenas Marquez <acm@FreeBSD.org>
  *  Andreas Klemm <andreas@klemm.gtn.com>
  *  Andrew Pantyukhin <infofarmer@FreeBSD.org>
  *  Andrey Zakhvatov
  *  Anton Berezin <tobez@FreeBSD.org>
  *  Anton Berezin <tobez@tobez.org>

Remove # $FreeBSD$ from Makefiles.

Return ports maintained by John Marino to the pool, he is no longer interested.

Submitted by:	Mark Millard via private e-mail

Return the ports mistakenly reset to ports@ in r433856 to John Marino.

The mistake was completely on my part, I somehow connected the dots the
wrong way in my head.

The only exceptions (for now) are archivers/zstd and ports-mgmt/synth
which were already picked up by new volunteers in the mean time.

Return ports maintained by John Marino to the pool, see r433827 for details

Rebase gnatdroid to gcc6-aux (6.0), add support for MARSHMELLOW

The gnatdroid cross-compilers (*BSD => Android) were the last two users
of gcc-aux (gcc 4.9 Ada compiler).  They are now based on gcc6-aux.

The Android NDK release 11 just came out with support for Android API 23
(Marshmellow) so now gnatdroid supports it.  I removed API 8 and 9
(Froyo and Gingerbread) from gnatdroid-armv7.  Froyo currently is installed
on less than 0.1% of Android devices, and Gingerbread is dropping under 2%
soon.  Many sysroot distfiles were re-rolled to gain required headers, so
a distfiles subdirectory was added as well.

lang/gnatdroid-sysroot(-x86): Only for i386 and amd64

The gnatdroid sysroot* and binutils* ports do build on other
architectures, but the actually gnatroid cross-compilers do not.
Until this changes, there is no point to build the dependencies
so suppress their building on non-x86 platforms.

Add gnatdroid-x86 (3 new ports), X-compiler to Android-x86

Similar to lang/gnatdroid-armv7, lang/gnatdroid-x86 is a cross-compiler
targetting Android. The former targets ARMv7 processors while the latter
targets Android on x86 (32-bit).  The latter also runs on Virtualbox as
a bonus.  The new ports are implemented as slaves to the ARMv7 versions.

The GNAT ACATS were run, and it passed every test except CXG2024,
"accuracy of multiplication and division of mixed decimal and binary
fixed point numbers".
subtest 13: expected -51.00 got 50.0
subtest 14: expected 51.0 got 50.0

This is probably a rounding error unique to 32-bit x86.  Overall this
version passed better than gnatdroid-armv7 because unwind is supported,