Moved compatibility module to compat package.

Author: jaraco

tests/compat/__init__.py

@@ -9,7 +9,7 @@
 import functools
 import contextlib
 
-from .py39compat import os_helper
+from .compat.py39 import os_helper
 
 from . import _path
 from ._path import FilesSpec

tests/py39compat.py renamed to tests/compat/py39.py

@@ -5,7 +5,7 @@
 import importlib
 import importlib_metadata
 import contextlib
-from .py39compat import os_helper
+from .compat.py39 import os_helper
 
 import pyfakefs.fake_filesystem_unittest as ffs