Changes to ghc

Changes to ghc:
commit fa8553de237a2f91f8551d69ef604c1d8a007b5f
Author: Reid Barton <rwbarton@gmail.com>
Date:   Sun Jul 6 16:34:32 2014 -0400

    Fix imports in GHC.Event.Poll when not HAVE_POLL_H (#9275)

    Though as far as I can tell, we can never successfully build under
    this configuration anyways: GHC.Event.TimerManager requires the Poll
    backend to be functional.