Changes to ghc

Changes to ghc:
commit e4a4abae21d14a6c1a4ae875fa582e2b389dc177
Author: Austin Seipp <austin@well-typed.com>
Date:   Fri Jan 17 10:49:21 2014 -0600

    Fix #8675

    Haddock no longer has a generated parser, so we don't need it in the
    sdist and we certainly don't want to check for it in the ./configure
    script (as that would be bogus.)

    Signed-off-by: Austin Seipp <austin@well-typed.com>