Backport of this xorg-xserver commit:

  commit cfd3443fe81685e91a53063dee58e24a5684dc29
  Author: Peter Hutterer <peter.hutterer@who-t.net>
  Date:   Wed Jan 28 13:34:10 2009 +1000

    Xext: rename saver's EventType to SaverEventType.

    Avoid namespace clashing with the internal events.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>