limits example output depends on platform

The limits example expected to output inf for Infinity, nan for Quiet NAN and Signaling NAN. But actually the output depends on the platform (see STDCXX-51).
The example should produce the inf for Infinity, the qnan for Quiet NAN and snan for Signaling NAN on all platforms (http://www.mail-archive.com/stdcxx-dev@incubator.apache.org/msg03703.html).