[Bug libstdc++/71135] rl78-elf libstdc++ FTBFS with some multilibs

[yselkowi at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71135

--- Comment #5 from Yaakov Selkowitz <yselkowi at redhat dot com> ---
Possible patch included in attachment 38505 for bug 71133.