Resolves 'CInt' build errors related to FFI type restrictions in GHC 7.6

GHC 7.6 has stopped allowing 'newtype' types in FFI calls and trying to build this file will result in errors like this: Unacceptable argument type in foreign declaration: CInt

It can be fixed by simply including the constructor for the type.

Longer description here:
http://hackage.haskell.org/trac/ghc/ticket/5610