Remove # $FreeBSD$ from Makefiles.

Add USES=xorg USES=gl, ports categories x

Add USES=xorg and USES=gl to ports in categories starting with 'x'
While here, try to sprinkle other USES (mostly gnome and sdl) as needed.

Update WWW: SF redirects to https://sourceforge.net/projects/<PROJECT_NAME>/

Remove libintl.so.9 compatibility link that was added in r374303 to
prevent massive PORTREVISION bumps.  Bump dependent ports that have not
been bumped since.

Most commonly used build systems support silent builds, when they
hide actual commands executed and only show short summary line (like
"CC foo.c"). CMake and ninja enable this by default, some autotools
using ports do as well. This is unacceptable because we need complete
build logs at any time, so we now switch to verbose build logs
unconditionally. Note that this change deliberately affects ALL
builds and not only package builds on cluster, because we need to
be sure that user experiencing failure can always provide informative
build log regardless of settings and without rerunning the build.

Change summary:

- Always do verbose builds for cmake, ninja and GNU configure (the
  latter includes check if --disable-silent-rules is actually supported
  by the configure script; there are isolated cases when it's not true)

- Drop @dirrm* from pkg-plists

Approved by:	portmgr blanket

- Fix missing library problems when the linker enforces explicit linking

PR:		192062
Exp-run by:	antoine
Approved by:	portmgr (antoine)

Stage support

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

Add an explicit dependency on pkgconf

- Cleanup Makefile a bit (sort knobs), add a comment
- Drop maintainership: port is stable enough to fly solo

Add a port of sbxkb, modernized replacement for classic xxkb.  It sometimes
works better in modern desktop environments.

Feature safe:	yes