Changes to ghc

Changes to ghc:
commit 46ec4aefbfdde4e22e5e6cbfc66f36459ac1cb1b
Author: Mateusz Kowalczyk <fuuzetsu@fuuzetsu.co.uk>
Date:   Thu Jun 19 01:31:39 2014 +0200

    haddock-library: allow 7.4.x building

    Updates submodule