[MacPorts] #25475: cmake: libidn dependency should be depends_lib not depends_build

[MacPorts]

#25475: cmake: libidn dependency should be depends_lib not depends_build
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 Reporter:  snc@…             |       Owner:  css@…           
     Type:  defect            |      Status:  assigned        
 Priority:  Normal            |   Milestone:                  
Component:  ports             |     Version:  1.9.99          
 Keywords:                    |        Port:  cmake           
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Comment(by css@…):

 Returning from more travel, but this patch looks ok to me. I'll verify a
 build today.

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Ticket URL: <http://trac.macports.org/ticket/25475#comment:9>
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