pythongh-25177: fix bad rebase of moved test file

During the process of merging in a year and a half of changes, the
modified test file `test_loading.py` accidentally got converted to a
newly added file in an old location, rather than an existing test file
with an updated test.

Merge the changes in this file into the new canonical location since
pythongh-93839, and delete the old file.

Lib/test/test_ctypes/test_loading.py

@@ -116,6 +116,12 @@ def test_1703286_B(self):
         # This is the real test: call the function via 'call_function'
         self.assertEqual(0, call_function(proc, (None,)))
 
+    @unittest.skipUnless(os.name == "nt",
+                         'test specific to Windows')
+    def test_load_hasattr(self):
+        # bpo-34816: shouldn't raise OSError
+        self.assertFalse(hasattr(windll, 'test'))
+
     @unittest.skipUnless(os.name == "nt",
                          'test specific to Windows')
     def test_load_dll_with_flags(self):