[MacPorts] #58882: Python37 configure script requires an update of MACOSX_DEPLOYMENT_TARGET rules for upcoming macOS 10.15

[MacPorts]

#58882: Python37 configure script requires an update of MACOSX_DEPLOYMENT_TARGET
rules  for upcoming macOS 10.15
-----------------------+----------------------
  Reporter:  vdoublie  |      Owner:  jmroot
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  python37  |
-----------------------+----------------------
Changes (by vdoublie):

 * Attachment "main_patched.log" added.

 forcing MACOSX_DEPLOYMENT_TARGET to 10.14 so generate-posix-vars knows
 what to do

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