[MacPorts] #29440: Update Doxygen to 1.7.4

[MacPorts]

#29440: Update Doxygen to 1.7.4
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 Reporter:  rouson@…           |       Owner:  css@…           
     Type:  update             |      Status:  assigned        
 Priority:  Normal             |   Milestone:                  
Component:  ports              |     Version:                  
 Keywords:                     |        Port:  doxygen         
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Changes (by css@…):

  * status:  new => assigned


Comment:

 Looks like it should be an easy update, I'll verify this evening.

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Ticket URL: <https://trac.macports.org/ticket/29440#comment:2>
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