[Bug bootstrap/86057] Use of mempcpy in libgcc/ libgcov-driver-system.c breaks bootstrap

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86057

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed on darwin too.