[MacPorts] #30989: doxygen: Please upgrade to 1.7.5.1

[MacPorts]

#30989: doxygen: Please upgrade to 1.7.5.1
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 Reporter:  eborisch@…             |       Owner:  macports-tickets@…                   
     Type:  defect                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.0.1                                
 Keywords:                         |        Port:  doxygen                              
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 A new version of Doxygen is available -- please update the portfile. It
 looks like the +tcl variant may no longer be required, but I'm not 100%
 certain.

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Ticket URL: <https://trac.macports.org/ticket/30989>
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