[Bug bootstrap/51450] configure's test for -fno-rtti -fno-exceptions broken

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51450

--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
Is this an issue with upstream libtool, too, or just GCC's patched version of
it?