Ok, we'll try this again.

io-xpm.c: Fixed.  Now actually loads XPMs instead of a big black blob.

configure.in : yes, I know it was broken.  It wasn't finished quite yet (I
always have larger fish to fry)

Oh, and if anyone touches this module again without emailing the people in
AUTHORS, I will go ballistic (after spending precious time figuring out why
this commit never happened the 1st time I tried...)