Skip test when InterpreterPoolExecutor missing

Author: ashm-dev

Lib/test/test_struct.py

@@ -800,14 +800,13 @@ def test_c_complex_round_trip(self):
                     round_trip = struct.unpack(f, struct.pack(f, z))[0]
                     self.assertComplexesAreIdentical(z, round_trip)
 
-    @unittest.skipUnless(
-        support.Py_GIL_DISABLED,
-        'this test can only possibly fail with GIL disabled'
-    )
     def test_endian_table_init_subinterpreters(self):
         # Verify that the _struct extension module can be initialized
         # concurrently in subinterpreters (gh-140260).
-        from concurrent.futures import InterpreterPoolExecutor
+        try:
+            from concurrent.futures import InterpreterPoolExecutor
+        except ImportError:
+            raise unittest.SkipTest("InterpreterPoolExecutor not available")
 
         code = "import struct"
         with InterpreterPoolExecutor(max_workers=5) as executor: