[MacPorts] #61236: OpenBLAS 0.3.10_1 +native Build Fails on MacOS 10.15.6 and Xcode 12.0

[MacPorts]

#61236: OpenBLAS 0.3.10_1 +native Build Fails on MacOS 10.15.6 and Xcode 12.0
-----------------------+-------------------------
  Reporter:  mascguy   |      Owner:  NicosPavlov
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.3
Resolution:            |   Keywords:
      Port:  OpenBLAS  |
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Comment (by mascguy):

 Also of note, OpenBLAS +native builds successfully in my other three MacOS
 releases:

 10.12.6
 10.13.6
 10.14.6

 (Albeit with earlier versions of Xcode, as appropriate for each MacOS
 release.)

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Ticket URL: <https://trac.macports.org/ticket/61236#comment:8>
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