[MacPorts] #59337: py37-astor does not build on mac os x 10.15

[MacPorts]

#59337: py37-astor does not build on mac os x 10.15
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  Reporter:  tiperiu   |      Owner:  emcrisostomo
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.1
Resolution:            |   Keywords:  catalina
      Port:  py-astor  |
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Comment (by cjones051073):

 Issue is not specific to macOS 10.15. I see it on macOS 10.13 (if you
 force a build from source).

 Upstream has a ticket for it

 https://github.com/berkerpeksag/astor/issues/162

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Ticket URL: <https://trac.macports.org/ticket/59337#comment:3>
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