[Bug other/79885] fix-includes does not honor the value passed to --with-build-sysroot=, looks for /usr/include instead of looking within the SDK

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79885

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Try --with-build-sysroot= instead.