[Patch] libstdc++/9580

[Paolo Carlini]

Hi,

the below fixes the compilation error that Pétur was seeing by
consistently changing the generic definitions of underflow and
uflow to do nothing and adding the specializations for char
and wchar_t: we do *not* have a generic _M_underflow_common
which generic underflow and uflow can use!

Tested x86-linux.

Is this the best we can do right now?

Paolo.

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