[Bug c++/65801] [5/6 Regression] Allow -Wno-narrowing to silence stricter C++11 narrowing rules

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65801

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Ok, thus what shall we do? Shall we go back to my minimal patch which only
touched enums? https://gcc.gnu.org/ml/gcc-patches/2014-08/msg00880.html