pythongh-109959: Skip test_glob.test_selflink() flaky test (pythonGH-128812)

(cherry picked from commit 1153e66)

Co-authored-by: Victor Stinner <[email protected]>

Author: vstinner

Lib/test/test_glob.py

@@ -385,6 +385,10 @@ def test_glob_many_open_files(self):
 @skip_unless_symlink
 class SymlinkLoopGlobTests(unittest.TestCase):
 
+    # gh-109959: On Linux, glob._isdir() and glob._lexists() can return False
+    # randomly when checking the "link/" symbolic link.
+    # https://github.com/python/cpython/issues/109959#issuecomment-2577550700
+    @unittest.skip("flaky test")
     def test_selflink(self):
         tempdir = TESTFN + "_dir"
         os.makedirs(tempdir)