Fix undefined references in libstdc++fs.a
The recent patch for PR 83306 removed the fs_err_concat functions that
were used by the experimental::filesystem::filesystem_error class as
well. This fixes it by doing the string generation directly in
filesystem_error::_M_gen_what() instead of using the removed function.
PR libstdc++/83306
* src/filesystem/path.cc (filesystem_error::_M_gen_what()): Create
string directly, instead of calling fs_err_concat.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@266569 138bc75d-0d04-0410-961f-82ee72b054a4