[Bug ada/85036] --disable-bootstrap --enable-languages=ada[,c++] fails

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85036

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Created attachment 43736
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43736&action=edit
Tentative fix

Richard, please give it a try, as specialist of weird build setups. ;-)