[Patch/RFC] Fix libstdc++/9533

[Paolo Carlini]

Hi,

the below fixes the problem by implementing a non-trivial showmanyc(),
as discussed thoroughly on the list during the last weeks.

Tested x86-linux.

In particular, I would appreciate by reassured that the new
__basic_file<>::showmanyc_helper deals correctly with the various
possibilities.

Thanks,
Paolo.

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