Changes to ghc

Changes to ghc:
commit 696bfc4ba5fce6b75cc91bcb67c5d0a3c9f29bd2
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Tue Mar 18 11:06:57 2014 +0100

    Update submodule to Win32-2.3.0.2

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