Resolves 'CInt' build errors related to FFI type restrictions in GHC 7.6.1

GHC 7.6.1 has restricted newtypes in FFI declarations 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 'CInt' type.

Longer description here:
http://hackage.haskell.org/trac/ghc/ticket/5610