[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 mmoll@…):

 I have attached an updated patch for the latest version currently,
 1.8.9.1.

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Ticket URL: <https://trac.macports.org/ticket/44730#comment:4>
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