[MacPorts] #62421: mkvtoolnix 55.0.0: fails to build on macOS 10.14.6

[MacPorts]

#62421: mkvtoolnix 55.0.0: fails to build on macOS 10.14.6
-------------------------+------------------------
  Reporter:  mopihopi    |      Owner:  ryandesign
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:
      Port:  mkvtoolnix  |
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Comment (by i0ntempest):

 qbittorrent is another port that needs C++17 stuff, you can try messing
 with it on Yosemite if you'd like.

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Ticket URL: <https://trac.macports.org/ticket/62421#comment:5>
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