Changes to ghc

Changes to ghc:
commit 69559a42c3dcf97afd0f394b06a8186edce0744f
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Thu Nov 14 11:17:31 2013 +0100

    Update `Cabal` to 1.18.1.2 (again)

    Cabal was already updated to 1.18.1.2. last month, but then got reverted
    by accident by 06aac68dee100b21dc7d304fa90d9baa423507a0

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