[Bug bootstrap/82141] [8 Regression] raised RTSFIND.RE_NOT_AVAILABLE : rtsfind.adb:851 on darwin

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82141

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
r251754 is also OK. Most of the changes between r251754 and r251817 come from
Ada.