[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 #9 from Yury Gribov <y.gribov at samsung dot com> ---
I don't think this patch got to gcc-patches.  I don't know how to repro
original error so I can't bootstrap myself.