conflict between libstdc++ nan and c99/builtin nan functions

[Gabriel Dos Reis]

"Kaveh R. Ghazi" <ghazi@caip.rutgers.edu> writes:

| And the nan function provided by libstdc++-v3 appears to only be there
| to support the NAN macro.  So I'll submit a patch to zap both after I
| test it.

Thanks a lot.

-- Gaby