[MacPorts] #16614: Update Doxygen 1.5.5 to 1.5.6

[MacPorts]

#16614: Update Doxygen 1.5.5 to 1.5.6
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  Reporter:  luis.beca at gmail.com  |       Owner:  css at macports.org
      Type:  enhancement          |      Status:  closed          
  Priority:  Normal               |   Milestone:  Port Updates    
 Component:  ports                |     Version:  1.6.0           
Resolution:  fixed                |    Keywords:                  
      Port:  doxygen              |  
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Comment(by luis.beca at gmail.com):

 Doxygen 1.5.6 fails to build at the patch phase (please see attached log).

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Ticket URL: <http://trac.macports.org/ticket/16614#comment:3>
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