[MacPorts] #40021: gtk-osx-application: add support for gtk3

[MacPorts]

#40021: gtk-osx-application: add support for gtk3
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 Reporter:  devans@…     |      Owner:  elelay@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.2.0
 Keywords:               |       Port:  gtk-osx-application
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 The current port (2.0.1) blocks installation for any configuration other
 than gtk2 but the underlying
 source has support for either gtk2 or gtk3.

 It would useful if this port could be modified to include variants for
 gtk2/gtk3 or both if that
 can be accommodated.

 For instance see #40016.

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Ticket URL: <https://trac.macports.org/ticket/40021>
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