Changes to ghc

Changes to ghc:
commit b4a820f97e48199a92f5ce7216731500f9a841c9
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Mon Apr 14 09:04:31 2014 +0200

    Update Haddock submodule to follow LHsBindsLR changes

    This submodule update was forgotten to be included in
    eeaea2df3fa585db503034f419c6e4331a4d8a84

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>