[MacPorts] #63714: python39 @3.9.7: build failure on Monterey/M1

[MacPorts]

#63714: python39 @3.9.7: build failure on Monterey/M1
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 Reporter:  tglsfdc  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:           |       Port:  python39
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 I'm getting a failure at the destroot step while trying to install
 python39 on a just-updated-to-macOS-12.0.1
 2020 Mac M1 mini.  The thing that is confusing me is that yesterday I
 successfully installed the same port on a
 brand new M1 MacBook Pro.  There shouldn't be any difference, in theory.
 I guess it has to do either with the mini's OS being upgraded to Monterey
 from (originally) Big Sur, or with some problem with updating MacPorts
 from Big Sur to Monterey.  I tried fully uninstalling MacPorts and
 reinstalling it, but that didn't help.

 The other thing I'm confused about is why I'm getting a compile error at
 the destroot step rather than build.

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Ticket URL: <https://trac.macports.org/ticket/63714>
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