[MacPorts] #45966: gtk3 @3.14.5 +quartz : cherry pick a recent commit to fix a missing GTK_IS_PLUG?

[MacPorts]

#45966: gtk3 @3.14.5 +quartz : cherry pick a recent commit to fix a missing
GTK_IS_PLUG?
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 Reporter:  gellule.xg@…  |      Owner:  macports-tickets@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.3
 Keywords:                |       Port:  gtk3
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 Building gtk3 with the +quartz variant causes problems like the following:
     dyld: lazy symbol binding failed: Symbol not found: _GTK_IS_PLUG
       Referenced from: /opt/local/lib/libgtk-3.0.dylib
       Expected in: flat namespace

 This is solved by a commit more recent than 3.14.5:
 https://git.gnome.org/browse/gtk+/commit/?h=gtk-3-14&id=0b8f666e022d983db2cefaffb24315dc34b26673

 Could this be cherry picked? I'm attaching the patch to use.

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Ticket URL: <https://trac.macports.org/ticket/45966>
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