[MacPorts] #55712: cmark: New port needed

[MacPorts]

#55712: cmark: New port needed
------------------------+-------------------
 Reporter:  ryandesign  |      Owner:
     Type:  request     |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  cmark
------------------------+-------------------
 cmark is required for mkvtoolnix as of version 20.0.0

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Ticket URL: <https://trac.macports.org/ticket/55712>
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