[MacPorts] #57643: pulseaudio: Examine gtk3 dependency

[MacPorts]

#57643: pulseaudio: Examine gtk3 dependency
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  Reporter:  ryandesign  |      Owner:  Ionic
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  pulseaudio  |
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Comment (by Ionic):

 Hmm, as far as I remember, some binaries used GTK3 in the past, like
 `pavumeter`. Not sure if these binaries are still built, so yeah, maybe we
 can drop the `gtk3` dependency. I'll have to investigate.

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Ticket URL: <https://trac.macports.org/ticket/57643#comment:1>
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