Remove expired ports:

2019-12-31 accessibility/linux-c6-atk: Superseded by CentOS 7
2019-12-31 audio/exaile-devel: this port is older than audio/exaile
2019-12-31 audio/linux-c6-alsa-lib: Superseded by CentOS 7
2019-12-31 audio/linux-c6-alsa-plugins-oss: Superseded by CentOS 7
2019-12-31 audio/linux-c6-alsa-plugins-pulseaudio: Superseded by CentOS 7
2019-12-31 audio/linux-c6-alsa-utils: Superseded by CentOS 7
2019-12-31 audio/linux-c6-flac: Superseded by CentOS 7
2019-12-31 audio/linux-c6-libaudiofile: Superseded by CentOS 7
2019-12-31 audio/linux-c6-libogg: Superseded by CentOS 7
2019-12-31 audio/linux-c6-libsndfile: Superseded by CentOS 7
2019-12-31 audio/linux-c6-libvorbis: Superseded by CentOS 7
2019-12-31 audio/linux-c6-mikmod: Superseded by CentOS 7
2019-12-31 audio/linux-c6-nas-libs: Superseded by CentOS 7

Address some portlint warnings in the Linux infrastructure ports.

Eliminate LINUXNAME from port Makefiles.  This was just a helper variable
without special meaning outside port Makefiles but several developers have
copied it to new ports where it was then unused, apparently thinking that
it did have some special meaning.

Eliminate RPMVERSION from Linux ports and set DISTVERSIONSUFFIX instead.
This puts all version information together in the port Makefiles.

emulators/linux-c6: Update to CentOS 6.10

PR:		229979
Submitted by:	Piotr Kubaj <pkubaj@anongoth.pl>
Reviewed by:	xmj

Update to 1.900.1-21.el6_9.

- Autodetect the installed linux_base port and use LINUX_DEFAULT only as
  a last resort.
- Construct a list of DISTFILES for every architecture (amd64, i386).
  Select one list for regular make and all lists for make makesum so linux
  ports can have one combined distinfo file.
- Set DIST_SUBDIR?=centos so there's only one copy of common distfiles.
- Use MASTER_SITES and DISTFILES groups so make fetch is a bit smarter.
- Regenerate all distinfo files.
- For linux_base-c6 (just like linux_base-c7 already does) turn bin, lib,
  lib64 and sbin into symbolic links to the same directory under usr.
  This fixes the problem where some programs/libraries exist under / on
  FreeBSD and /usr on Linux or vice versa and then depending on the order
  of search paths Linux programs may run/load FreeBSD programs/libraries
  and fail.
- Turn usr/share/icons into a symbolic link to LOCALBASE/share/icons so

Make 64 bit Linux packages the default on amd64.

- Replace Mk/bsd.linux-apps.mk and Mk/bsd.linux-rpm.mk with
  Mk/Uses/linux.mk.
- Replace USE_LINUX=yes with USES+=linux and USE_LINUX=(.*) with
  USES+=linux:\1 in all ports.
- Replace USE_LINUX_APPS with USE_LINUX in all ports.
- Use INSTALL_SCRIPT instead of INSTALL_PROGRAM to install scripts in some
  ports.
- When USE_LINUX_RPM is defined, simplify the way DISTFILES and EXTRACT_ONLY
  are defined.
- Remove BRANDELF_DIRS and BRANDELF_FILES handling.  In the very rare cases
  that it is still necessary ports can run ${BRANDELF} from post-patch.
- Remove AUTOMATIC_PLIST handling.  Only one port used it.
- Fix Linux MASTER_SITES.
- Replace OVERRIDE_LINUX_BASE_PORT and OVERRIDE_LINUX_NONBASE_PORTS with
  default versions framework.

Make the port actually work with the current ports tree.

Add dependency on linux-c6-jpeg.

Add graphics/linux-c6-jasper, required by graphics/linux-c6-gdk-pixbuf2.