haskell-compile should use shell-quote-argument

I don't use haskell-mode, but I like to answer Emacs questions on Stack Overflow. I came across this: https://stackoverflow.com/questions/46042828/directory-not-found-when-compiling-haskell-with-emacs, and I think it could be easily fixed by using `shell-quote-argument`.

E.g.

(format haskell-compile-command (shell-quote-argument srcname))