[CFT] CentOS 6.7 ports

[Miguel C]

FYI I'm not getting any crashes with a recent head build (I noticed the was
some stuff fixed on CURRENT so I'm assuming that's it)

uname -v
`FreeBSD 11.0-CURRENT #1 r294634+7f50f5e(master)-dirty`


I would like to test with linux-sublime3 and see if the 64bit version is
usable, but I'm not sure what are the required steps, I've noticed
linux-c6-flashplugins includes different distinfo's and pkg-plist, but the
Makefile 'hardcodes' the i386 disfile, so it see the 32bit bin/libs are
always installed, but I'm assuming there some way to handle this in the
Makefile based on:

# LINUX
OVERRIDE_LINUX_BASE_PORT=c6_64
OVERRIDE_LINUX_NONBASE_PORTS=c6_64


!?

Many thanks for all the work done so far, and I hope I can help a bit by at
least testing and maintaining linux-sublime3