[MacPorts] #40402: graphviz, graphviz-devel: Add python27 variant

[MacPorts]

#40402: graphviz, graphviz-devel: Add python27 variant
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 Reporter:  md14-macports@…  |      Owner:  macports-tickets@…
     Type:  enhancement      |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.2.0
 Keywords:  haspatch         |       Port:  graphviz, graphviz-devel
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 Please add a python27 variant to the graphviz and graphviz-devel ports.
 These ports already have python24, python25, and python26 variants. The
 attached patches have the changes.

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Ticket URL: <https://trac.macports.org/ticket/40402>
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