improve __buitin_mul_overflow() checks #209
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Use <stddef.h> as a source for size_t as suggested by ANSI in preference to <sys/types.h> (as suggested by POSIX), and make sure that the check includes linkin so it won't result in a false positive in platforms that allow link time resolution of unknown objects (ex: AIX with lxc)
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Improve the checks introduced with 4678857 (add a C23 inspired checked integer multiplication helper (#198), 2023-02-03) and that could result in build failures at least in AIX with xlc