add mkvtoolnix v8.5.2

[cytec]

as requested: #974

@Dr-Bean i've only tested with cedarview 5.1 and 5.2 toolchain atm... compiles fine but 2 things:

1. you'll have to set LC_ALL=C manually in terminal before executing any of the binaries or they crash with terminate called after throwing an instance of 'std::runtime_error' what(): locale::facet::_S_create_c_locale name not valid Aborted (core dumped)
2. I've put python in build_depends as the lib/bin files are not needed on the device but somehow it copys them over anyway... what's the correct way to remove unneeded stuff from the final package? ex: all bin tools except the mkv... ones?

EDIT: i've selected v8.5.2 because it's the last version which compiles with gcc < 4.8

[Dr-Bean]

I would have suggested to setting LC_ALL + calling the binary in a small script, and put that on PATH, but presumably all four binaries would need that same treatment :/
Probably best to mention it in a help page/wiki or even the package description.

As for Python's PLIST, cross/boost includes Python as DEPENDS: that way Python's PLIST would still be processed. Maybe see if changing boost to use BUILD_DEPENDS works: Deluge is the only other package that uses boost, and it shouldn't need to include Python either.