SDL ... with multitap!

[Drakonite]

For those of you that don't follow svn commits...

Earlier today I commited changes to SDL, among which is multitap support! ... it was a royal pain to get this working with everything so I hope people get some use out of it..

A few notes:
MTAP support requires XSIO2MAN and XPADMAN bios modules, which may not be present on extremely old (v0 jap) PS2s.

If for some reason you need to disable mtap support you can edit the ENABLE_MTAP option in the makefile and then rebuild sdl. (sdl with mtap disabled will use non-X modules)

MTAP enabled SDL will reset the iop if sio2man is loaded.

If you are using ps2link from memcard, you will need at least ps2link v1.41 in order to debug mtap enabled sdl