[MacPorts] #50972: mkvtoolnix Upgrade to 9.0.0?

[MacPorts]

#50972: mkvtoolnix Upgrade to 9.0.0?
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  Reporter:  skycrawl@…  |      Owner:  ryandesign
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  mkvtoolnix  |
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Comment (by mf2k):

 Thanks. [https://guide.macports.org/#development.patches Per the
 guidelines], please instead attach a unified diff of the Portfile so we
 can easily see what changes you are proposing.

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Ticket URL: <https://trac.macports.org/ticket/50972#comment:7>
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