Tony Finch 7474cad4ad Add <isc/overflow.h> for checked mul, add, and sub ...

The `ISC_OVERFLOW_XXX()` macros are usually wrappers around
`__builtin_xxx_overflow()`, with alternative implementations
for compilers that lack the builtins.

Replace the overflow checks in `isc/time.c` with the new macros.

2023-06-27 12:38:09 +02:00

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