[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
 Keywords:                |       Port:  gtk-doc
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 In r124901 gtk-doc got a dependency on source-highlight. This is a problem
 because source-highlight depends on boost, and boost doesn't build on
 older systems (#44918). This causes problems for all sorts of ports that
 depend on gtk-doc.

 Could the dependency be either removed (since we know gtk-doc built fine
 without it before), or if it is thought to be very useful, then placed in
 a variant, which is off by default at least on Mac OS X 10.5 and earlier?

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