[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:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.2.0
Resolution:                       |   Keywords:
      Port:  gtk-osx-application  |
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Comment (by devans@…):

 Attached is an amended version of your Portfile that builds +gtk3 and
 allows gtksourceview3 +quartz to build.  Just needed to change your pre-
 configure block to work with either gtk2 or gtk3.  Thanks.

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Ticket URL: <https://trac.macports.org/ticket/40021#comment:6>
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