[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 kitchen.andy@…):

 > Thanks cal, I'll try and have a look at that later in the week, one
 would expect there to be an option to disable the
 > building of the users guide.

 Well the best I can come up with is this:
 pre-build {
   system "echo >${worksrcpath}/docs/users_guide/ghc.mk"
 }

 Maybe I'm just not very clever, or the GHC build system
 is not particularly flexible.

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Ticket URL: <https://trac.macports.org/ticket/25558#comment:36>
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