[MacPorts] #70296: sigil crashes on arm64 trying to open an ePub if built with libunwind active

[MacPorts]

#70296: sigil crashes on arm64 trying to open an ePub if built with libunwind
active
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  Reporter:  barracuda156  |      Owner:  i0ntempest
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:  sonoma, arm64
      Port:  sigil         |
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Comment (by ryandesign):

 Let's not add a `conflicts libunwind` line to every port. Let's fix
 libunwind instead. See #66250.

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Ticket URL: <https://trac.macports.org/ticket/70296#comment:4>
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