[GHC] #4374: Remove in-tree gmp

[GHC]

#4374: Remove in-tree gmp
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    Reporter:  igloo             |        Owner:  igloo       
        Type:  task              |       Status:  new         
    Priority:  high              |    Milestone:  7.2.1       
   Component:  Build System      |      Version:  7.1         
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by igloo):

 Would fix #4366.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4374#comment:1>
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