[MacPorts] #65283: rawtherapee: build currently broken, due to recent segregation of gtk-osx-application-gtk3

[MacPorts]

#65283: rawtherapee: build currently broken, due to recent segregation of gtk-osx-
application-gtk3
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  Reporter:  mascguy      |      Owner:  jasonliu--
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.2
Resolution:               |   Keywords:
      Port:  rawtherapee  |
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Comment (by jasonliu--):

 Ok, I think I've got it. I wasn't able to figure out why CMake was
 compiling but not linking the lib, so I instead went ahead and made it so
 that CMake is able to utilize pkgconfig to locate {{{gtk-mac-integration-
 gtk3}}}.

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Ticket URL: <https://trac.macports.org/ticket/65283#comment:4>
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