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

*: fix tab vs. space issues, and comments according to the guide.

Remove # $FreeBSD$ from Makefiles.

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

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

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

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 d, e, f, and g.

With hat:	portmgr
Sponsored by:	Absolight

- Switch to options helpers
- While here, add some NO_ARCHes

Approved by:	portmgr blanket

databases/apq-mysql: Support default MySQL (5.6)

This port generates some headers based on MySQL headers, and a couple
of the variables must have been deprecated because the resulting
variable name ended in "__UNUSED".  Double underscores are not allowed
in Ada, so the build broke.

Since the Ada header is generated during the configure phase, I'm adding
a post-configure target to replace "__" with "_" to restore the build.

Since the dependencies change from MySQL 5.5 to MySQL 5.6, revbump.

databases/apq*: Remove @dirrm from four ports

APQ ports: apq, apq-mysql, apq-pgsql, apq-odbc

Without direction, GPRconfig will create a cgpr file at the standard
$PREFIX/lib/gnat repository.  This is the cause of the builder
failures because it touches a part of the userland it's not supposed to.

GPRconfig should be modified not to do this; it is never desirable.
In the meantime, the fix for APQ is to specify .cgpr targets which do
not exist so GPRconfig creates them there instead of $PREFIX/lib/gnat.

Reported by: swills

Add new Ada database ports: apq, apq-mysql, apq-pgsql, apq-odbc

APQ is a database interface library written in Ada95.  This is the base
library, but it is not useful without a driver.  There are three drivers
available for PostgreSQL, MySQL, and ODBC in separate ports.

Some features:
  * Thick binding
  * Strong typing support
  * Full BLOB support (PGSQL)
  * High performance BLOB I/O via streams
  * Full support for NULL Values
  * Fully portable (database neutral) code possible
  * Four levels of debug tracing

WWW: https://bitbucket.org/kowframework/apq