[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
 Keywords:               |       Port:  avahi
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 This is required to update libepc and glom to their latest versions and
 probably an increasing number of others.

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