Changes to ghc

Changes to ghc:
commit 52c6dc970272437aa83a936fc1fe63977fa6178d
Author: Austin Seipp <austin@well-typed.com>
Date:   Mon Mar 31 06:47:44 2014 -0500

    Temporarily fight off build bogons on OS X

    Right now there's a bug with Clang that prevents 'cabal haddock' from
    working nicely. But there's an easy fix for now.

    Signed-off-by: Austin Seipp <austin@well-typed.com>