[MacPorts] #60511: move to quartz as default backend

[MacPorts]

#60511: move to quartz as default backend
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  Reporter:  ra1nb0w                             |      Owner:  dbevans
      Type:  enhancement                         |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  R Togl VLC VLC2 avahi cairo cairo-  |
  devel cairomm cherrytree clutter cogl          |
  gWakeOnLAN gconf gegl gegl-0.3 gegl-devel      |
  geoclue2 glade glib2 glib2-devel glibmm        |
  gnome-themes-extra gnubg gnucash-docs gtk-     |
  sharp2 gtk2 gtk3 gtkextra3 gtkimageview gtkmm  |
  gtkmm3 gtkspell2 inkscape inkscape-devel       |
  inkscape-gtk3-devel lablgtk2 libVLC libVLC2    |
  librsvg meld netgen opencolorio pan2 pango     |
  pango-devel pangomm pdfpc pidgin pspp pspp-    |
  devel py-cairo py-gobject py-pygtk reinteract  |
  tix tk tkdnd tkimg tktable ufraw webkit2-gtk   |
  webkit2-gtk-devel wxgtk-3.0                    |
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Comment (by kencu):

 homebrew has enabled only quartz on gtk3...fyi. so they make that
 work...and leave out any formulae that don't work with quatrz, I suppose.

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Ticket URL: <https://trac.macports.org/ticket/60511#comment:10>
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