[MacPorts] #39784: Doxygen @1.8.3.1: update to 1.8.4

[MacPorts]

#39784: Doxygen @1.8.3.1: update to 1.8.4
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  Reporter:  egall@…  |      Owner:  css@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  doxygen  |
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Comment (by egall@…):

 Also it fixes the `echo -n` issue that we currently apply a patch for:
 https://bugzilla.gnome.org/show_bug.cgi?id=673218#c5

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Ticket URL: <https://trac.macports.org/ticket/39784#comment:3>
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