[PATCH, v3] Bringing <mutex> and <condition_variable> up to spec.

[Paolo Carlini]

Hi,
> > Attached patch brings <mutex> and <condition_variable> up to spec
> > (n2691 WD) given that <chrono> is now in.
> 
> Excellent, thanks. This looks good to me.

Yeah, committed!

Thanks,
Paolo.