Backport of this xorg-xserver commit:

  commit a82e6efb7b9b2ab9a1597b002f375c5ee105e7f5
  Author: Adam Jackson <ajax@redhat.com>
  Date:   Wed Jul 16 14:19:04 2008 -0400

    Remove the numVideoScreens xprintism.

    This was to account for cases where you had video and print screens in
    the same server.  Lunacy.  Leave the slot in ScreenInfo, but rename it,
    and stop looking at it.