[Patch] Fix libstdc++/12206

[Paolo Carlini]

Hi,

seems an abvious fix: just mimic the logic already present in the
basic_filebuf::basic_filebuf() constructor: *only* if the locale
turns out to have a codecvt facet use &use_facet for _M_codecvt,
otherwise set it to zero.

Tested x86-linux. Ok with everyone?

Paolo.

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