[Bug libstdc++/90045] [9 Regression] fails to build a rx-elf cross toolchain with C++ enabled

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90045

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
That is, r262804 or more likely r262375 (not yet confirmed).  This currently
causes sub-package FAILs for our GCC 9 package builds.