PATCH to libstdc++: Don't be sloppy about names used in templates

[Gabriel Dos Reis]

Paolo Carlini <pcarlini@unitus.it> writes:

| Andreas Schwab wrote:
| 
| >What about snprintf (ifdef GLIBCXX_USE_C99)?  Will it need a std:: prefix
| >as well?
| >
| I think so.

I tried before applying the patch: it does not work.
For some reason snprintf is not in std::. 

-- Gaby