Update generator script to use the new license file header.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351650 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/language.support/support.limits/support.limits.general/generate_feature_test_macro_components.py

@@ -828,10 +828,9 @@ def produce_tests():
     test_body = \
 """//===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //