[MacPorts] #38217: doxygen: Should not depend on graphviz

[MacPorts]

#38217: doxygen: Should not depend on graphviz
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  Reporter:  larryv@…     |      Owner:  css@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  doxygen      |
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Comment (by jmr@…):

 A default variant would mean that everyone gets graphviz pulled in unless
 they specifically know to disable the variant, which seems like it defeats
 the purpose of the change. Also, wouldn't the variant do nothing but add a
 dependency, and not change the installed files at all? That's not really
 what variants should be used for.

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Ticket URL: <https://trac.macports.org/ticket/38217#comment:2>
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