[MacPorts] #38864: avahi: please add +gtk3 variant

[MacPorts]

#38864: avahi: please add +gtk3 variant
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  Reporter:  devans@…     |      Owner:  pixilla@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:
      Port:  avahi        |
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Comment (by devans@…):

 Committed in r108416 with no objections received.

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Ticket URL: <https://trac.macports.org/ticket/38864#comment:3>
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