[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 awesome bob eigen3 fish     |
  gerbil gnome-vfsmm gnuradio goocanvasmm gr-    |
  osmosdr kdeaddons3 kdebase3 kdelibs3 libexif   |
  libgphoto2 libspectre ogre openni rpm rpm45    |
  rpm50 rpm51 rpm52 rpm53 rpm54 sofia-sip xorg-  |
  libxcb                                         |
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Comment (by eborisch@…):

 Implemented for eigen3 in r103748

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Ticket URL: <https://trac.macports.org/ticket/38217#comment:5>
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