[Patch/RFC] Sebor's const correctness issue

[Paolo Carlini]

Hi,

in privare mail Benjamin suggested (*many* thanks!) using mutable
to fix the const correctness issue put forward by Martin Sebor.

Indeed, the below stems quite straightforwardly from making
locale::facet::_M_references mutable and locale::_Impl::_M_facets
of type const facet**.

Would that approach (regtests ok on x86-linux) be viable for trunk?

Paolo.

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