[MacPorts] #58882: Python37 configure script segfaults in generate-posix-vars on macOS 10.15

[MacPorts]

#58882: Python37 configure script segfaults in generate-posix-vars on macOS 10.15
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  Reporter:  vdoublie  |      Owner:  jmroot
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  python37  |
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Comment (by trainman75):

 I just tried adding the lines mentioned in the commit from comment:24, and
 success. Python37 builds where it didn't before.
 With nothing more than an educated guess, I placed them just before
 "build.target    all"
 I had been running Catalina beta and Xcode11 beta, but the build issue was
 present in that configuration. Updated both to public release in the last
 few days, still no luck.
 Reinstalled MacPorts from binary, still no go.
 Hope this helps track down a fix.

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Ticket URL: <https://trac.macports.org/ticket/58882#comment:30>
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