[MacPorts] #69735: mkvtoolnix-legacy is broken on legacy systems

[MacPorts]

#69735: mkvtoolnix-legacy is broken on legacy systems
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  Reporter:              |      Owner:  i0ntempest
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.9.3
Resolution:              |   Keywords:  mountainlion, lion, snowleopard,
      Port:              |  leopard, tiger
  mkvtoolnix-legacy      |
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Comment (by i0ntempest):

 I don't think there's an upper limit for boost version, but v58 being
 released before boost 1.81 may not be compatible. You can try.

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Ticket URL: <https://trac.macports.org/ticket/69735#comment:5>
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