[MacPorts] #58159: doxygen @1.8.14: update to 1.8.15

[MacPorts]

#58159: doxygen @1.8.14: update to 1.8.15
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 Reporter:  FranklinYu  |      Owner:  cssdev
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  doxygen
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Ticket URL: <https://trac.macports.org/ticket/58159>
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