[MacPorts] #20719: ghc: update to 6.10.4

[MacPorts]

#20719: ghc: update to 6.10.4
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 Reporter:  ryandesign@…             |       Owner:  gwright@…           
     Type:  request                  |      Status:  new                 
 Priority:  Normal                   |   Milestone:                      
Component:  ports                    |     Version:  1.7.1               
 Keywords:                           |        Port:  ghc                 
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 ghc 6.10.4 is available so the ghc port should probably be updated to that
 version. The port's livecheck should also be fixed so that it picks up and
 informs you about new versions.

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Ticket URL: <http://trac.macports.org/ticket/20719>
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