[MacPorts] #37436: avahi: new variant for qt4 support

[MacPorts]

#37436: avahi: new variant for qt4 support
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 Reporter:  pvanek@…     |      Owner:  pixilla@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.2
 Keywords:               |       Port:  avahi
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 this small patch allows to compile avahi with Qt4 support - using qt4
 event loop.

 It won't affect currently used apps.

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Ticket URL: <https://trac.macports.org/ticket/37436>
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