[MacPorts] #67055: python portgroup overwrites PYTHONPATH in test.env

[MacPorts]

#67055: python portgroup overwrites PYTHONPATH in test.env
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  Reporter:  dgilman  |      Owner:  reneeotten
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by jmroot):

 Sure, I can commit it. Just wanted to verify that it fixes the originally
 reported problem first.

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Ticket URL: <https://trac.macports.org/ticket/67055#comment:11>
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