[MacPorts] #35867: libarchive: update to 3.x

[MacPorts]

#35867: libarchive: update to 3.x
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  Reporter:  ryandesign@…  |      Owner:  toby@…
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  libarchive    |
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Comment (by toby@…):

 Yes, I believe it's just ABI compatibility, the API is (mostly) unchanged.

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Ticket URL: <https://trac.macports.org/ticket/35867#comment:5>
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