[Bug bootstrap/61315] wide-int.cc cannot be built by darwin system compiler

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61315

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
A patch has been posted at
https://gcc.gnu.org/ml/gcc-patches/2014-05/msg02173.html.