[MacPorts] #25558: update ghc to 6.12.x

[MacPorts]

#25558: update ghc to 6.12.x
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 Reporter:  jwiegley@…          |       Owner:  gwright@…           
     Type:  update              |      Status:  new                 
 Priority:  Normal              |   Milestone:                      
Component:  ports               |     Version:                      
 Keywords:                      |        Port:  ghc ghc-devel       
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Comment(by ryandesign@…):

 Has duplicate #26481.

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Ticket URL: <https://trac.macports.org/ticket/25558#comment:8>
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