b968c3452b
After moving the std::to_chars base 10 implementation from the dylib to the header the integral overloads of std::to_chars are available on all platforms. Remove the _LIBCPP_AVAILABILITY_TO_CHARS availability macro and update the tests. Depends on D125704 Reviewed By: ldionne, #libc Differential Revision: https://reviews.llvm.org/D125745