[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 didn't check, but it is possible that previous version worked with ruby
 1.8 and nobody noticed any problem because OS X ships with ruby anyway.

 For me the `ruby` port installs `/opt/local/bin/ruby1.8`, so `/usr/bin/env
 ruby` would not work both because the executable has the wrong name and
 also because it's at the wrong version.

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Ticket URL: <https://trac.macports.org/ticket/43222#comment:9>
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