[Bug bootstrap/89140] libiberty/pex-unix.c fails to compile in aarch64-to-x86_64 cross build

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89140

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>the configure script for libiberty finds that getrusage is not available but 
>wait4 is.

Both should be there.