CD1.ITK is the one CD archive file the Urban Runner scripts open
themselves in NO_CD mode. Since the PSP has extremely limited file
handles, having that archive opened twice makes the load code fail
on that device.
Hopefully, the scripts don't decide to close and not reopend CD1.ITK
in places where it's needed. A full playthrough with loading/saving
between screens (especially across CD content borders, and during
death screens) would probably be prudent.
Seems like the game does close the CD1.ITK too, so we just
open all ITKs right at the start, lest it might blow up when
it wants to close the top ITK and that's actually CD4.
svn-id: r55461
