[MacPorts] #65903: pg python: check for files installed to ${python.prefix}, and fail build if any present

[MacPorts]

#65903: pg python: check for files installed to ${python.prefix}, and fail build if
any present
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  Reporter:  mascguy                          |      Owner:  (none)
      Type:  defect                           |     Status:  assigned
  Priority:  Normal                           |  Milestone:
 Component:  ports                            |    Version:  2.7.2
Resolution:                                   |   Keywords:
      Port:  py-about-time py-pytest-datadir  |
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Changes (by reneeotten):

 * owner:  reneeotten => (none)


Comment:

 agreed that ports shouldn't install stuff in ```python.prefix```; not sure
 though if checking for that has a place in the ```python`` PG or whether I
 should own this ticket.

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Ticket URL: <https://trac.macports.org/ticket/65903#comment:7>
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