[MacPorts] #25558: ghc: update to latest version

[MacPorts]

#25558: ghc: update to latest version
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 Reporter:  jwiegley@…          |       Owner:  gwright@…           
     Type:  update              |      Status:  assigned            
 Priority:  Normal              |   Milestone:                      
Component:  ports               |     Version:                      
 Keywords:                      |        Port:  ghc ghc-devel       
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Comment(by allbery.b@…):

 Wait, ghc 7.4.2?  Are we joining the list of folks who figure abandoning
 the Haskell Platform that is the standard Haskell development target is
 somehow a good idea?

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Ticket URL: <https://trac.macports.org/ticket/25558#comment:65>
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