Patch to eliminate some signed/unsigned warnings

[Kaveh R. Ghazi]

Another patch sitting around for two months.

http://gcc.gnu.org/ml/gcc-patches/2001-08/msg01784.html

The only piece that was still relevant was the combine.c bit, since
the rest of it was dealt with by other people's patches in the mean
time. :-/

I installed the combine.c part as obvious.

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Kaveh R. Ghazi			Engagement Manager / Project Services
ghazi@caip.rutgers.edu		Qwest Internet Solutions