libstdc++: Enable tests for std::stoi etc. unconditionally [PR110653]
Since the narrow string versions of std::stoi, std::stol, std::stoul,
std::stof and std::stod are now always defined, we don't need to check
dg-require-string-conversions in the relevant tests.
libstdc++-v3/ChangeLog:
PR libstdc++/110653
* testsuite/21_strings/basic_string/numeric_conversions/char/stod.cc:
Remove dg-require-string-conversions.
* testsuite/21_strings/basic_string/numeric_conversions/char/stof.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stoi.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stol.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stoul.cc:
Likewise.