Skip test on platforms without symlinks.

Author: vsajip

Lib/test/test_logging.py

@@ -800,6 +800,7 @@ def lock_holder_thread_fn():
 
             support.wait_process(pid, exitcode=0)
 
+    @unittest.skipIf(support.is_wasi or support.MS_WINDOWS, "Platform does not support symlinks.")
     def test_135683(self):
         # See gh-135683