[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
-------------------------+----------------------
  Reporter:  tiperiu     |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.1
Resolution:              |   Keywords:  catalina
      Port:  py37-astor  |
-------------------------+----------------------

Comment (by mf2k):

 In the future, please add the port maintainer(s) to Cc ({{{port info
 --maintainers py37-astor}}}), if any.

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Ticket URL: <https://trac.macports.org/ticket/59337#comment:1>
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