Changes to ghc

Changes to ghc:
commit c7498bbdaa74dadd976c75c4e303c2050aa78277
Author: Edward Z. Yang <ezyang@cs.stanford.edu>
Date:   Thu Apr 10 18:28:11 2014 -0700

    Fix #8641, creating directories when we have stubs.

    Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>