[MacPorts] #33806: graphviz: add bindings for python2.7

[MacPorts]

#33806: graphviz: add bindings for python2.7
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 Reporter:  michael.klein@…                     |       Owner:  macports-tickets@…                   
     Type:  enhancement                         |      Status:  new                                  
 Priority:  Normal                              |   Milestone:                                       
Component:  ports                               |     Version:  2.0.4                                
 Keywords:  haspatch                            |        Port:  graphviz                             
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 see attached patch

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Ticket URL: <https://trac.macports.org/ticket/33806>
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