[Bug libstdc++/97163] Build error with -mcpu=power9 on ppc64

[pkubaj at anongoth dot pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97163

--- Comment #1 from Piotr Kubaj <pkubaj at anongoth dot pl> ---
This is on FreeBSD head, which uses ELFv2.