[Bug target/80007] --disable-bootstrap with gnat-5 leads to failed gnat-7 build on aarch64

[tulipawn at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80007

--- Comment #8 from PeteVine <tulipawn at gmail dot com> ---
It was about -O3 -fomit-frame-pointer, but yeah, I don't care one bit either.

Just make sure `--enable-languages=ada` works. (c++ is not being inferred so
you end up with no xg++)