[Bug d/91628] libdruntime uses glibc internal symbol on s390

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91628

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Though, looking at libdruntime, it already handles that and has several *.S
files.