Changes to ghc

Changes to ghc:
commit 65170fcb5c864f285bfbb9414be65cf001168e80
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Sun Feb 9 15:24:00 2014 +0100

    Let `make distclean` remove `/{ch01,ch02,index}.html`

    These files are created during `./configure` and therefore
    by convention are expected to be removed by `make distclean`.

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