[Bug other/63694] [5.0 Regression] Build error compiling asan.c: strtoull undeclared

[y.gribov at samsung dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63694

--- Comment #5 from Yury Gribov <y.gribov at samsung dot com> ---
John, would you mind sending a (tested) patch to gcc-patches? I only have
access to Linux systems which are irrelevant.