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

[GHC]

#5061: Implement FFI spec behaviour for *CString family
---------------------------------+------------------------------------------
    Reporter:  batterseapower    |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Component:  Compiler    
     Version:  7.0.3             |    Keywords:              
    Testcase:                    |   Blockedby:              
          Os:  Unknown/Multiple  |    Blocking:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------

Comment(by batterseapower):

 See also #3309 #3308 #3307

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5061#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler