In preparation of the update of glib remove the -reference ports

Those ports mainly concern old Gnome2 libraries, the behaviour of this infra
is not compatible with the meson build system (being used in newer version)
the documentation is provided otherwise in the other version

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 PORTREVISION for ports depending on the canonical version of GCC
in the ports tree (via Mk/bsd.default-versions.mk and lang/gcc) which
has now moved from GCC 6 to GCC 7 by default.

This includes ports
 - featuring USE_GCC=yes or USE_GCC=any,
 - featuring USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and those
 - with USES=compiler specifying one of openmp, nestedfct, c11, c++0x,
   c++11-lib, c++11-lang, c++14-lang, c++17-lang, or gcc-c++11-lib.

PR:		222542

Fix port builds for architectures which remain on gcc as the default compiler.
This will primarily help powerpc64.

For archs where clang is the default compiler, these changes will have no
effect, as the base compiler already has these capabilities (primarily, but
not exclusively, c++-11).

Tested for no-harm on amd64.

While here, pet portlint.

Approved by:	portmgr (tier-2 blanket)

Update the gtk+ stack [1]

Update gdk-pixbuf2 to 2.36.6
Update gtk30 to 3.22.12
Update cairomm to 1.12.2
Update gtkmm30 to 3.22.0

Update the following themes to be compatible with the new gtk+ version:
Update adwaita-icon-theme to 3.22.0
Update gnome-themes-standard to 3.22.3
Update gtk-E17-theme to 3.22.1 [2]
Update gtk-arc-themes to 20170302 [3]
Update mate-themes to 3.22.10

Bump xfce4-notifyd due to new gtk30 version, requested by olivierd@.
Mark LordsaWar broken, it doesn't build with cairomm 1.12.

PR:		210272 [1], 210696 [2], 218667 [3]
Submitted by:	Matthew Rezny [2]
Obtained from:	Unless otherwise stated obtained from GNOME devel repo
Exp-run by:	antoine@ [1]

Remove ${PORTSDIR}/ from dependencies, categories v, w, x, y, and z.

With hat:	portmgr
Sponsored by:	Absolight

- Drop @dirrm* from and add empty directories to pkg-plists

Approved by:	portmgr blanket, kwm (for gnome@ ports)

Convert GMAKE to MAKE_CMD
Please note that lots of invocation of MAKE_CMD here are wrong as they do not
properly respect MAKE_ENV and friends

With hat:	portmgr

- Stage support for all -reference ports
- Nuke NOPORTDOCS, those ports are already IGNOREd with NOPORTDOCS

Approved by:	kwm (maintainer)

Add NO_STAGE all over the place in preparation for the staging support (cat:
x11-toolkits)

Add an explicit dependency on pkgconf

- update png to 1.5.10

Update the glib and gtk stack to the lastest stable releases.
Add new ports for the new stable releases of gtk+-3.0.
Update vala to the newest stable release 0.12.1.

Thanks to pav@ for doing multiple exp-runs, and marcus@ for repo-copies.
Full contributors acknowledgment will be given in the GNOME 3 import.

Remove files from a repocopy gone bad.