[GHC] #5061: Implement FFI spec behaviour for *CString family

[GHC]

#5061: Implement FFI spec behaviour for *CString family
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    Reporter:  batterseapower    |        Owner:              
        Type:  bug               |       Status:  patch       
    Priority:  normal            |    Milestone:              
   Component:  Compiler          |      Version:  7.0.3       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by igloo):

 Will there still be a way to get the actual bytes that were passed?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5061#comment:7>
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