[Patch] libstdc++/32509

[Paolo Carlini]

Hi,

this is the patch I mean to apply to mainline and 4_2-branch to resolve 
the issue without regressing on 31717: essentially we are back to the 
behavior pre-31717 + the minimal AC_EGREP_CPP sanity check always 
carried out (either when the gnu locale model is explicitely configured 
or tried on auto).

Tested x86-linux, auto, generic, gnu.

Paolo.

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