Modifications to allow gtk (as of the 980816 CVS snapshot) to
compile without errors on SGI IRIX 6.3 (IDO 7.1).  As I'm not a regular
gtk developer, I can't attest as to the conformity of the changes to original
design intentions, but the changes are quite minor and primarily involve
type-checking pedantics.

-spc

 /-                Sean Cier <scier@PostHorizon.com>                -\
(         If only you could see what I've seen with your eyes         )
 \-                http://www.PostHorizon.com/scier                 -/