Remove linux-c6-libGLU and linux-c7-libGLU.  They were used in combination
with nvidia-driver but linux-*-dri is now used instead.

- 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.

Use LINUX_REPO_ARCH instead of LINUX_RPM_ARCH when setting DISTINFO_FILE
and PLIST for Linux ports.  LINUX_RPM_ARCH is the CPU targetted by a
package and LINUX_REPO_ARCH is like our ARCH which is more suitable.  This
only affects Centos 6 ports because they are the only ones where
LINUX_REPO_ARCH != LINUX_RPM_ARCH.

Change all occurrences of xmj@chaot.net to johannes@perceivon.net as the owner
requested.

This only affects "Created by" lines with one exception: devel/uclcmd. There the
maintainer is changed. This was overlooked in r416918.

Approved by: junovitch (mentor)

Update Linux ports to Centos 6.8.

PR:		210373
Submitted by:	Piotr Kubaj <pkubaj@anongoth.pl>
Differential Revision:	https://reviews.freebsd.org/D6891

CentOS ports: for c6_64, install 32bit libraries alongside

PR:		206943
Submitted by:	xmj

Welcome Centos 6.7

- Upgrade all linux-c6- to CentOS 6.7
- Cleanups

PR:                     205846
Submitted by:           xmj
In Collaboration with:  allanjude, netchild, xmj
Exp-run:                antoine
Sponsored by:           Perceivon Hosting Inc.
Differential Revision:  D3428

We'd like to thanks for all the feedback and comments.

Re-commit of
64 bit linuxulator support (not activated by default):
 - most of the work was done by Alan Jude
 - all errors are mine
 - 64bit (may) have rough edges
 - I validated
    * that the 32bit part doesn't has deinstall regressions (incl. EXP runs by
      antoine)
    * 29 of 72 64bit ports ports don't have deinstall leftovers (more validation
      later, when I dare to activate the 64bit linuxulator in the kernel)
 - the infrastructure part looks mature enough to let more test-bunnies get
   some experience with the new 64 bit parts
 - to use it you shall have no linux ports installed and have to specify
   (on your own risk) the following in make.conf before installing the ports:
   OVERRIDE_LINUX_BASE_PORT=c6_64

Unbreak INDEX, reverting r392921

With hat:	portmgr

64 bit linuxulator support (not activated by default):
 - most of the work was done by Alan Jude
 - all errors are mine
 - 64bit (may) have rough edges
 - I validated
    * that the 32bit part doesn't has deinstall regressions
    * 29 of 72 64bit ports ports don't have deinstall leftovers (more validation
      later, when I dare to activate the 64bit linuxulator in the kernel)
 - the infrastructure part looks mature enough to let more test-bunnies get
   some experience with it
 - to use it you shall have no linux ports installed and have to specify
   (on your own risk) the following in make.conf before installing the ports:
   OVERRIDE_LINUX_BASE_PORT=c6_64
   OVERRIDE_LINUX_NONBASE_PORTS=c6_64

graphics/linux-c6-libGLU: upgrade to 10.1

- upgrade to 10.1

Differential Revision:	https://reviews.freebsd.org/D1144
Reported by:	Nikolai Lifanov <lifanov@mail.lifanov.com>
Approved by:	swills (mentor)

graphics/linux-c6-libGLU: Port of CentOS 6.5's Mesa libGLU

Add port of CentOS 6.5's libGLU library. This allows several games to be used
with the new CentOS ports.

While here:
 - Add c6 libglu to Mk/bsd.linux-apps.mk
 - Add to emulators/linux-c6 as dependency, bump PORTREVISION

Differential Revision:	https://reviews.freebsd.org/D841
Approved by: swills (mentor)
Approved by: portmgr (bapt)