[Bug ada/81878] --disable-bootstrap --enable-languages=ada fails

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81878

--- Comment #50 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Do we want lang_requires="c c++" in ada's config-lang.in, then?