gh-104469: Convert _testcapi/exceptions to use AC (gh-104502)

Author: corona10

Lib/test/test_capi/test_exceptions.py

@@ -66,7 +66,7 @@ def check_fatal_error(self, code, expected, not_expected=()):
             rc, out, err = assert_python_failure('-sSI', '-c', code)
 
         err = decode_stderr(err)
-        self.assertIn('Fatal Python error: test_fatal_error: MESSAGE\n',
+        self.assertIn('Fatal Python error: _testcapi_fatal_error_impl: MESSAGE\n',
                       err)
 
         match = re.search(r'^Extension modules:(.*) \(total: ([0-9]+)\)$',

Lib/test/test_faulthandler.py

@@ -270,7 +270,7 @@ def check_fatal_error_func(self, release_gil):
                 """,
                 2,
                 'xyz',
-                func='test_fatal_error',
+                func='_testcapi_fatal_error_impl',
                 py_fatal_error=True)
 
     def test_fatal_error(self):