[GHC] #4496: use system libffi on Linux

[GHC]

#4496: use system libffi on Linux
---------------------------------+------------------------------------------
    Reporter:  juhpetersen       |        Owner:              
        Type:  bug               |       Status:  new         
    Priority:  normal            |    Milestone:  7.2.1       
   Component:  Build System      |      Version:  7.0.1       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Linux             |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
Changes (by igloo):

  * milestone:  => 7.2.1


Comment:

 We should look into whether it's feasible to use the system libffi on all
 platforms.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4496#comment:1>
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