Changes to ghc

Changes to ghc:
commit 34b072177b687c8fcc24f87293beae0752e82d32
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Thu Mar 20 09:20:06 2014 +0100

    Convert haddock into a proper submodule (re #8545)

    This should help contribute content to

      https://ghc.haskell.org/trac/ghc/wiki/WorkingConventions/Git/Submodules

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