[MacPorts] #62450: gobject-introspection: Switch to python 3.9

[MacPorts]

#62450: gobject-introspection: Switch to python 3.9
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  Reporter:  mf2k                   |      Owner:  dbevans
      Type:  enhancement            |     Status:  assigned
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:
Resolution:                         |   Keywords:
      Port:  gobject-introspection  |
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Comment (by kurthindenburg):

 per jmr suggestion, I added "build.env SETUPTOOLS_USE_DISTUTILS=local"
 which fixed the build here.

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Ticket URL: <https://trac.macports.org/ticket/62450#comment:4>
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