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

[MacPorts]

#43423: Add gtk variant to py-graph-tool
----------------------------+--------------------------------
  Reporter:  tiago@…        |      Owner:  macports-tickets@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.2.1
Resolution:                 |   Keywords:  maintainer
      Port:  py-graph-tool  |
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Comment (by mmoll@…):

 That works for me. This warning is shown repeatedly (with or without
 patch), but that could be a bug in the quartz version of gtk3 and/or
 [py]cairo:
 {{{
 (foo.py:33533): Gdk-CRITICAL **: gdk_cairo_region: assertion 'region !=
 NULL' failed
 }}}
 I'll commit the gtk3 variant and your patch.

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Ticket URL: <https://trac.macports.org/ticket/43423#comment:7>
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