[MacPorts] #20117: libidn: update to 1.15

[MacPorts]

#20117: libidn: update to 1.15
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 Reporter:  ryandesign@…             |       Owner:  olaf@…            
     Type:  update                   |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:  1.7.1             
 Keywords:                           |        Port:  libidn            
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 libidn should be updated from 1.13 to 1.15.

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Ticket URL: <http://trac.macports.org/ticket/20117>
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