[Patch] Fix libstdc++/12077 (take 2)

[Paolo Carlini]

Hi again,

ok, I agree with Pétur that a simpler fix is in order, that doesn't
add a new member and simply falls back to base class showmanyc.

I will wait a while then apply the below to mainline and 3_4-branch
*after* 3.4.0.

Tested x86-linux.

Paolo.

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