[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 saagarjha):

 Seems like you're right; can I submit a PR with that patch for python37 or
 were there other plans with this bug?

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Ticket URL: <https://trac.macports.org/ticket/60515#comment:1>
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