[Patch] Fix exception unsafety of __numpunt_cache

[Paolo Carlini]

... I like *much* more the version below: we early set _M_allocated in
__numpunct_cache<_CharT>::_M_cache, in this way if any of the new
throws, then catched by __use_cache<>::operator(), the memory is
automatically freed by __numpunct_cache<>::~__numpunct_cache: very
clean!

Tested x86-linux.

Again, OK with you, Benjamin?

Paolo.

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