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

[MacPorts]

#25558: ghc: update to latest version
--------------------------------+-------------------------------------------
 Reporter:  jwiegley@…          |       Owner:  gwright@…           
     Type:  update              |      Status:  assigned            
 Priority:  Normal              |   Milestone:                      
Component:  ports               |     Version:                      
 Keywords:                      |        Port:  ghc ghc-devel       
--------------------------------+-------------------------------------------

Comment(by kitchen.andy@…):

 Ok, so here are the portfiles for GHC 7.4.2!

 The Port even fixes GHC build system link errors.

 Please test!

-- 
Ticket URL: <https://trac.macports.org/ticket/25558#comment:28>
MacPorts <http://www.macports.org/>
Ports system for Mac OS