[MacPorts] #67870: libarchive @3.7.0: build fails on Tiger for several reasons

[MacPorts]

#67870: libarchive @3.7.0: build fails on Tiger for several reasons
-------------------------+--------------------------
  Reporter:  kencu       |      Owner:  tobypeterson
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  Tiger
      Port:  libarchive  |
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Comment (by evanmiller):

 I was able to build just fine on Tiger with legacysupport and GCC7. There
 were a few test failures (maybe endian related?) but the compile was
 clean.

 Opened PR for legacysupport here: https://github.com/macports/macports-
 ports/pull/19852

 But will need a separate PR to enforce GCC7.

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Ticket URL: <https://trac.macports.org/ticket/67870#comment:8>
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