Changes to ghc

Changes to ghc:
commit 0af9e724e0ee40ade8f5eef99965a6e69d861826
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Thu Oct 17 09:41:35 2013 +0200

    Document -c in hp2hs(1)

    This fixes #8452.