[MacPorts] #43222: mkvtoolnix: upgrade to version 6.8.0

[MacPorts]

#43222: mkvtoolnix: upgrade to version 6.8.0
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  Reporter:  dgonyier@…  |      Owner:  macports-tickets@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  mkvtoolnix  |
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Comment (by mojca@…):

 I will be offline for a while. I would commit the patch, but I suspect
 that building will fail on buildbots where default ruby < 1.9 without an
 additional patch for drake. So I suggest that someone fixes this ruby
 issue and commits it together with the attached patch.

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Ticket URL: <https://trac.macports.org/ticket/43222#comment:4>
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