[libcxx] Handle changing of fr_FR locale thousand sep in Windows libcxx tests#83967

4-rodrigo-salazar wants to merge 2 commits intollvm:mainllvm/llvm-project:mainfrom

4-rodrigo-salazar:fix_windows_fr_fr_libcxx_tests24-rodrigo-salazar/llvm-project:fix_windows_fr_fr_libcxx_tests2Copy head branch name to clipboard