[Patch] Fix libstdc++/12540

[Paolo Carlini]

Hi again,

further testing (LC_ALL unset, LANG = xxx (!= "C"), at least one
category set to != xxx) revealed another possible memory leak path,
which may occur if memory allocation inside __str throws.

Therefore, instead of dealing explicitly, with this case too, seems
much better to me to change my original code for locale(const char*)
to not use strdup at all, but instead another basic_string for
__res too.

I have therefore tested the below, which I will commit soon.

Now, *always* for 12352 :)

==3673== LEAK SUMMARY:
==3673==    definitely lost: 0 bytes in 0 blocks.
==3673==    possibly lost:   0 bytes in 0 blocks.
==3673==    still reachable: 17840 bytes in 6 blocks.
==3673==    suppressed: 0 bytes in 0 blocks.

Paolo.

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