Changes to ghc

Changes to ghc:
commit 69cf5c4cb8aba309e5c495008b69089e5431a095
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Thu Jan 16 08:16:52 2014 +0100

    Update to `containers-0.5.4.0`

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