New arithmetic operators contributed to runtime library!

I am pleased to announce the first new contribution to this project after several years!!

[[Contributed by Martin Finda]]

Hi Alex,
Support for % ^ << >> operators is done.
I'm sending patch-lib-source+libgcc+libgcc1.S to You.
It was created during diff with libgcc1.S 1995-07-12 05:17:00.
I hope, that will be useful for other programmers.

Good day.
Martin