[Bug libffi/64572] r219477 breaks bootstrap on x86_64 darwin

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64572

--- Comment #15 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Running target unix-m64
> ERROR: couldn't load description file for unix-m64

I think it is pr64607.

> Well, then you'll have to figure out what else could have changed
> between r219474 and r219477, because the answer should have been
> nothing at all.
>
> The current darwin_c.c is an exact copy of the previous ffi.c.

What about the other files used by darwin?