[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:  haspatch
      Port:  mkvtoolnix  |
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Comment (by johnrosshunt):

 I should probably note pugixml was added as a dependency because the
 system version was newer than the mkvtoolnix included version.  In my
 limited testing, I didn't notice any difference.  Also, po4a & pandoc were
 added as optional dependencies.

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Ticket URL: <https://trac.macports.org/ticket/50972#comment:9>
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