PR libstdc++/86272 Fix undefined __glibcxx_check_insert_range2

[François Dumont]

Hi

 Â Â Â  I plan to commit attached patch to fix the __gnu_debug::string 
undefined macro.

 Â Â Â  Is it ok the way I used some tests to now validate 
__gnu_debug::string on check-debug ?

François

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