Update Lib/test/test_tarfile.py

Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>

Author: Zheaoli

Lib/test/test_tarfile.py

@@ -859,6 +859,8 @@ def test_read_through(self):
                                   "TarFile.extractfile() failed")
                     if not buf:
                         break
+
+    @unittest.skipIf(zlib is None, "requires zlib")
     def test_read_with_extra_header(self):
         with tarfile.open(tgzname_with_comment_extra_data_in_header,
                           mode="r|*") as _: