[MacPorts] #43423: Add gtk variant to py-graph-tool

[MacPorts]

#43423: Add gtk variant to py-graph-tool
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 Reporter:  tiago@…      |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.2.1
 Keywords:               |       Port:  py-graph-tool
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 It would be nice to have a variant which installs gtk+ 3 in case users
 want interactive visualization. The variant would be useful, since the
 library librsvg would also needed to be installed, which is not triggered
 simply by installing gtk, and is nonintuitive for most users.

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Ticket URL: <https://trac.macports.org/ticket/43423>
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