[MacPorts] #60148: mkvtoolnix: Update to version 43

[MacPorts]

#60148: mkvtoolnix: Update to version 43
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  Reporter:  mf2k        |      Owner:  ryandesign
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  mkvtoolnix  |
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Comment (by mf2k):

 I don't run older versions of macOS and have no interest in them. Please
 add a sub-port for the current version for older OSes and update to the
 latest.

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Ticket URL: <https://trac.macports.org/ticket/60148#comment:2>
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