Changes to ghc

Changes to ghc:
commit bb857596d1f09260908a0dd4f05cc25c2e822c4c
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Tue Apr 22 09:54:09 2014 +0200

    Adapt .gitignore (re #8545)

    This adapts the top-level .gitignore file to match the new situation of
    base.git, ghc-prim.git, integer-gmp.git, integer-simple.git, and
    template-haskell.git being folded into ghc.git

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