[MacPorts] #44730: upgrade to doxygen 1.8.8

[MacPorts]

#44730: upgrade to doxygen 1.8.8
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  Reporter:  kuba@…   |      Owner:  css@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.3.1
Resolution:           |   Keywords:  haspatch
      Port:  doxygen  |
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Comment (by kuba@…):

 For the reference: The issue #1 is
 https://bugzilla.gnome.org/show_bug.cgi?id=735194 and is fixed upstream so
 the fix won't be necessary for 1.8.9.

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Ticket URL: <https://trac.macports.org/ticket/44730#comment:2>
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