[MacPorts] #33836: doxygen: use get_canonical_archflags

[MacPorts]

#33836: doxygen: use get_canonical_archflags
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 Reporter:  ryandesign@…             |       Owner:  css@…           
     Type:  enhancement              |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:                  
 Keywords:  haspatch                 |        Port:  doxygen         
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 The doxygen port can be simplified by using the get_canonical_archflags
 procedure. The attached patch makes this change.

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Ticket URL: <https://trac.macports.org/ticket/33836>
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