[MacPorts] #42387: FindGTK2.cmake fails to find GTK with Quartz backend

[MacPorts]

#42387: FindGTK2.cmake fails to find GTK with Quartz backend
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 Reporter:  mmoll@…  |      Owner:  css
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.2.1
 Keywords:           |       Port:  cmake
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 See http://public.kitware.com/Bug/view.php?id=14593. Fixed upstream. So
 attached patch can be removed once cmake 3.0 comes out.

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Ticket URL: <https://trac.macports.org/ticket/42387>
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