[Patch] libstdc++/9548 and DR 231

[Paolo Carlini]

Hi,

the below, for trunk, fixes the bug and implements the resolution of
DR 231 (Ready): both _S_format_float and its call in _M_convert_float
become cleaner.

If the patch gets accepted I would like to apply something similar
to 3_3, keeping intact _S_format_float prototype for ABI-sake.

Tested x86-linux. Ok?

Paolo.

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