cleanup: Remove ports depending on expired lang/gcc6-aux

Keep ports-mgmt/synth and dependencies (including lang/gcc6-aux itself)
for now as synth is the only Ada port still maintained and might be
somewhat high-profile.

Removed ports:
archivers/zip-ada
cad/ghdl
databases/adabase
databases/apq
databases/apq-mysql
databases/apq-odbc
databases/apq-pgsql
devel/ada-util

net/anet: drop maintainership

Remove # $FreeBSD$ from Makefiles.

net/anet: update 0.4.0 to 0.4.1

  - adopt the port;
  - silent portlint.

Approved by:	araujo (mentor)
Differential Revision:	https://reviews.freebsd.org/D18523

- Update to 0.4.0

Bump PORTREVISIONs of all users of math/mpc that we just updated to
version 1.1.0 (via revision 464079).

- Update WWW

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

net/anet: Implement TCP_NODELAY socket option

net/anet: Upgrade version 0.3.1 => 0.3.3

There is one failure in the testsuite; the cause is not immediately
obvious.  I'll try to follow up later.

Failed :  1
  Tests for IP sockets:
   Error callback handling - Receiver not restarted FAIL     0.027554000s

Change Ada Framework foundation from gcc5-aux to gcc6-aux

GCC 6.1 was released this week.  The Ada Framework in FreeBSD ports has
been based on GCC 5.3 GNAT although GCC 6.x has been supported for awhile
via the ADA_DEFAULT option in make.conf.

Now that GCC 6 has been officially released, switch to it by default.
People can maintain the old foundation by putting "ADA_DEFAULT=5" in
/etc/make.conf.

Libraries built by one GNAT are unusable by another, so almost every Ada
port has been bumped as a result.  Noticable exceptions are dns/ironsides
which fails to build on gcc6 (thus USES=ada:5 is set) and cad/ghdl which
needs additional testing as it may require gcc5 on FreeBSD (DragonFly
uses the LLVM backend only).

Remove ${PORTSDIR}/ from dependencies, categories m, n, o, and p.

With hat:	portmgr
Sponsored by:	Absolight

Remove @dirrm from package list of 8 of my ports

net/anet: Upgrade version 0.3.0 => 0.3.1

net/anet: Install missing files and relocate static library

Natacha noticed that some of the source files were not being installed.
I tested the fix using PREFIX/lib/gnat/anet.gpr and then discovered it
was expecting libanet.a to be installed at PREFIX/lib rather than
PREFIX/lib/anet, so I modified the pkg-plist for that as well.

PR:		191406
Submitted by:	Natacha Porte
Patch by:	maintainer (marino)

net/anet: Upgrade version 0.2.3 => 0.3.0

This version fixes all the stuff the removed patches addressed (this
version was released as a direct result of these patches which I provided
upstream).  Multicast sending remains tricky, in part due to a known and
yet to be addressed bug in FreeBSD.

The pkg-message was deleted.  I don't completely understand what needs
to be established in order for IPv6 multicast to work (e.g. don't use
the same machine for sending and receiving) so rather than mislead, I
just removed this information for now.

net/anet: Fix build for gcc 4.9 and fix documentation too

Reported by:	pkg-fallout

net/anet: Fix properly

The problem with ahven was caused by a typo in the build targets.
The target "build_lib" was desired, but "build_all" was defined.
Fix target and return ahven to an optional dependency.
Tested in Reports, 8x pass

net/anet: ahven expected even if not needed

The Ahven test library was advertised as optional, but the internal
makefiles will fail if it is not present.  In the short term, change
Ahven from an optional to a mandatory dependency.

Reported by: pkg-fallout

Add new port net/anet (Ada IPv4 and IPv6 sockets binding library)

The ANet library was created on Linux and the unfortunate result is that
it is highly Linux-specific.  Luckily it has an implementation testsuite,
so patches to make it work on BSD can be reasonably tested.  The current
status is annoted in pkg-message:

=========================================================================
Beware of the IPv6 multicast functions.  Sending does work, but the
default interface effectively is invalid on *BSD.  A specific interface
needs to be provided rather than leaving interface blank (zero).

Multicast receiving may not currently work.  The test for IPv6 multicast
fails.  The test chunk is sent (verified with separate monitoring tool)
but never detected.  Hopefully the cause will be understood and fixed
soon.

AF_NETLINK and AF_PACKET protocols are not supported by *BSD, so the
associated tests have been removed.  Every test other than IPv6 Multicast
passes.  You may want to replace "em0" with this system's interface in
the test suite is to be run (see files/patch-tests_socket__tests.adb).