[MacPorts] #50279: gtk-doc: Add python34 and python35 variants

[MacPorts]

#50279: gtk-doc: Add python34 and python35 variants
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  Reporter:  mf2k@…       |      Owner:  devans@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gtk-doc      |
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Comment (by mf2k@…):

 Sounds good. Thank you!

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Ticket URL: <https://trac.macports.org/ticket/50279#comment:2>
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