Another bug Eric noticed. I had tests for create_directories() but not
create_directory(), and the former was already checking whether it
existed or not, so I didn't notice this bug.
PR libstdc++/71036
* src/filesystem/ops.cc (create_dir): Handle EEXIST from mkdir.
* tests
Another bug Eric noticed. I had tests for create_directories() but not
create_directory(), and the former was already checking whether it
existed or not, so I didn't notice this bug.
PR libstdc++/71036
* src/filesystem/ops.cc (create_dir): Handle EEXIST from mkdir.
* tests