committed fix for irq_tables

[Ronald G. Minnich]

All gcc 2.x users are now going to get a warning on the irq_tables.c 
compile. Sorry, but it will produce the right table, and 3.x will also 
produce the right table. I've confirmed this by comparing the .o files 
that both gcc's produce.

This may fix some of the problems 3.x users have been reporting.

I will confirm a good linuxbios-based boot as soon as I get in to work -- 
it's snowing here so we have 2-hour delays today.

ron