[MacPorts] #60515: python37: Fix configure for darwin 20+

[MacPorts]

#60515: python37: Fix configure for darwin 20+
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  Reporter:  ryandesign  |      Owner:  jmroot
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  python37    |
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Comment (by jmroot):

 This wasn't very urgent before the beta appeared, so I was waiting to see
 what upstream did. Which was this: https://bugs.python.org/issue41100

 I'll take care of this along with the update to the maintenance releases
 that just came out.

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Ticket URL: <https://trac.macports.org/ticket/60515#comment:2>
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