[MacPorts] #50236: gexiv2: Add python35 variant

[MacPorts]

#50236: gexiv2: Add python35 variant
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  Reporter:  mf2k@…       |      Owner:  devans@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gexiv2       |
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Comment (by mf2k@…):

 It looks easy enough to do. Please let me know if it is alright for me to
 go ahead and add it.

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Ticket URL: <https://trac.macports.org/ticket/50236#comment:1>
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