[MacPorts] #46403: graphviz @2.38.0_0, graphviz-devel @2.39.20141230.0545_0: replace deprecated Python variants with +python27

[MacPorts]

#46403: graphviz @2.38.0_0, graphviz-devel @2.39.20141230.0545_0: replace
deprecated Python variants with +python27
--------------------------------------+--------------------------
  Reporter:  larryv@…                 |      Owner:  ryandesign@…
      Type:  enhancement              |     Status:  new
  Priority:  Normal                   |  Milestone:
 Component:  ports                    |    Version:
Resolution:                           |   Keywords:  haspatch
      Port:  graphviz graphviz-devel  |
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Comment (by larryv@…):

 ping

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Ticket URL: <https://trac.macports.org/ticket/46403#comment:3>
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