Issues #23808, #25911: Trying to fix walk tests on Windows.

On Windows a symlink can has the FILE_ATTRIBUTE_DIRECTORY flag.

Author: serhiy-storchaka

Lib/test/test_os.py

@@ -770,7 +770,11 @@ def setUp(self):
         if support.can_symlink():
             os.symlink(os.path.abspath(t2_path), self.link_path)
             os.symlink('broken', broken_link_path, True)
-            self.sub2_tree = (sub2_path, ["link"], ["broken_link", "tmp3"])
+            if os.path.isdir(broken_link_path):
+                # On Windows a symlink can has the FILE_ATTRIBUTE_DIRECTORY flag.
+                self.sub2_tree = (sub2_path, ["broken_link", "link"], ["tmp3"])
+            else:
+                self.sub2_tree = (sub2_path, ["link"], ["broken_link", "tmp3"])
         else:
             self.sub2_tree = (sub2_path, [], ["tmp3"])