Use the boring old way of creating function pointers.

Author: ZeroIntensity

Lib/test/test_ctypes/test_callbacks.py

@@ -11,7 +11,7 @@
                     c_short, c_ushort, c_int, c_uint,
                     c_long, c_longlong, c_ulonglong, c_ulong,
                     c_float, c_double, c_longdouble, py_object)
-from ctypes.util import find_library, wrap_dll_function
+from ctypes.util import find_library
 from test import support
 from test.support import import_helper
 _ctypes_test = import_helper.import_module("_ctypes_test")
@@ -332,9 +332,10 @@ def test_narrow_int_return_widened(self):
         # gh-156933: Narrow integers were not widened on s390x
         CALLBACK = CFUNCTYPE(c_int)
 
-        @wrap_dll_function(CDLL(_ctypes_test.__file__))
-        def _testfunc_callback_int_to_longlong(func: CALLBACK) -> c_longlong:
-            pass
+        dll = CDLL(_ctypes_test.__file__)
+        _testfunc_callback_int_to_longlong = dll._testfunc_callback_int_to_longlong
+        _testfunc_callback_int_to_longlong.argtypes = [CALLBACK]
+        _testfunc_callback_int_to_longlong.restype = c_longlong
 
         @CALLBACK
         def cb():