singed integer overflow

[Ivan Sorokin]

I compiled m4 1.4.17 with -fsanitize=undefined enabled. -fsanitize=undefined is a compiler flag that enables runtime checks for different types of undefined behavior.

It turned out that a test 189.eval fails with m4 compiled with this option.

The problem is signed integer overflow. I fixed this problem in the same manner as it is done in evaluation of expressions.

See attached patch.

gnu-m4-1.4.17-fix-signed-integer-overflow.patch
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