[MacPorts] #53848: vigra: add support for python 3.6

[MacPorts]

#53848: vigra: add support for python 3.6
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 Reporter:  manuSrep  |      Owner:
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  vigra
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Ticket URL: <https://trac.macports.org/ticket/53848>
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