[Bug fortran/71839] undefined reference to `_gfortran_caf_stop_str'

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71839

--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Maybe I should ask the OpenCoarrays people.

Indeed!