[MacPorts] #45170: gtk-doc: remove source-highlight dependency or make it optional

[MacPorts]

#45170: gtk-doc: remove source-highlight dependency or make it optional
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  Reporter:  ryandesign@…  |      Owner:  devans@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.1
Resolution:                |   Keywords:
      Port:  gtk-doc       |
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Comment (by ryandesign@…):

 Before it got the source-highlight dependency (r124901), gtk-doc briefly
 had a dependency on the vim port (r123123) because OS X's vim didn't
 always work (#44546) but this had to be undone because it introduced a
 circular dependency when vim's +gtk2 variant was used.

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Ticket URL: <https://trac.macports.org/ticket/45170#comment:3>
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