Portability fixes for MicroHs

Control/Applicative/Backwards.hs

Control/Applicative/Lift.hs

Control/Monad/Trans/Except.hs

Control/Monad/Trans/Identity.hs

Control/Monad/Trans/Maybe.hs

Control/Monad/Trans/Writer/Lazy.hs

Control/Monad/Trans/Writer/Strict.hs

Data/Functor/Constant.hs

Data/Functor/Reverse.hs

transformers.cabal