[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 egall@…):

 From the mailing lists:

 > Perhaps a default variant (+diagrams)?

 I vote for that option.

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Ticket URL: <https://trac.macports.org/ticket/38217#comment:1>
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