Fix test_zlibng_version.

Author: serhiy-storchaka

Lib/test/test_zlib.py

@@ -107,7 +107,7 @@ def test_zlib_version(self):
 
     def _test_zlibng_version(self, v):
         self.assertIsInstance(v[:], tuple)
-        self.assertEqual(len(v), 4)
+        self.assertEqual(len(v), 3)
         self.assertIsInstance(v[0], int)
         self.assertIsInstance(v[1], int)
         self.assertIsInstance(v[2], int)