Changes to ghc

Changes to ghc:
commit db9c4f4c48aa03c75700e98870565f31ee84bd2c
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Tue Mar 4 22:19:37 2014 +0100

    Update `Cabal` to 1.18.1.3 release

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
    (cherry picked from commit 01f9ac3e977fb128388467a31f62e84d769e17ec)