Re: RFA: v3 PATCH to add on_quick_exit/quick_exit to std

[Paolo Carlini]

.. also, I think we should have #if __cplusplus >= 201103L protecting 
these functions too, exactly like all the other C++11 bits. Eg, I don't 
think we should unconditionally, ie in C++03 mode too, declare 
at_quick_exit and quick_exit in namespace std.

I can tweak things for the two issues I noticed.
Paolo.