[Patch] Fix exception unsafety of __numpunt_cache

[Paolo Carlini]

Hi,

after all the work for locale.cc and localename.cc, it looks like
there are three remaining new calls not wrapped in try/catch, thus
leading to memory leaks if the second or third throw.

I have fixed the problem in the standard way, already used everywhere.

Tested x86-linux.

Ok with you, Benjamin?

Paolo.

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