[MacPorts] #63458: python37 @3.7.12_0 can't build py37-setuptools on 10.4 or 10.5

[MacPorts]

#63458: python37 @3.7.12_0 can't build py37-setuptools on 10.4 or 10.5
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  Reporter:  fhgwright  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  python37   |
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Comment (by jmroot):

 Very little changed in this python version (note that we don't even use
 the bundled copy of expat):
 https://github.com/python/cpython/compare/v3.7.11..v3.7.12

 Could be something to do with the new libffi version?

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Ticket URL: <https://trac.macports.org/ticket/63458#comment:2>
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