[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 mopihopi@…):

 I tried ''patch-mkvtoolnix-7.0.0.diff'' on Snow Leopard.  It builds (using
 macports-gcc-4.7, as chosen by the Portfile), but mkvextract crashes.
 Apparently this is a longstanding known issue on all pre-Mavericks
 MacPorts builds of recent mkvtoolnix, caused by a mismatched C++ runtime
 (#34806/#40231).

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Ticket URL: <https://trac.macports.org/ticket/43222#comment:19>
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