[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:  css@…           
     Type:  update                 |      Status:  assigned        
 Priority:  Normal                 |   Milestone:                  
Component:  ports                  |     Version:  2.0.1           
 Keywords:                         |        Port:  doxygen         
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Comment(by css@…):

 Upgraded in r84175. I commented out `lion.patch`,  and everything built
 fine for me on Snow Leopard. Let me know if there are different patches
 needed for Lion support.

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Ticket URL: <https://trac.macports.org/ticket/30989#comment:3>
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