[Bug c++/69523] -Wliteral-suffix should not warn within namespace std

[eric at efcs dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69523

--- Comment #7 from Eric Fiselier <eric at efcs dot ca> ---
> The warning should be controlled by *some* flag, but I'm not sure whether or 
> not linking it with -Wliteral-suffix makes sense. I'll prepare a patch and 
> see what people think.

Any update? I would be happy with anything so long as I can enable warnings
again.