[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:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.1
Resolution:                |   Keywords:  haspatch
      Port:  gtk-doc       |
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Comment (by ryandesign@…):

 Thanks. Let's hold off on this for a moment. I believe I was able to fix
 boost for Tiger and Leopard just by removing the gcc 4.2 blacklisting;
 apparently whatever was preventing earlier versions from building with gcc
 4.2 is no longer a problem.

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Ticket URL: <https://trac.macports.org/ticket/45170#comment:8>
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