Match license header of test-drive

Author: awvwgk

src/tests/stdlib_test.fypp

@@ -1,4 +1,15 @@
-! SPDX-Identifier: MIT
+! This file is part of test-drive and redistributed with stdlib.
+! SPDX-Identifier: Apache-2.0 OR MIT
+!
+! Licensed under either of Apache License, Version 2.0 or MIT license
+! at your option; you may not use this file except in compliance with
+! the License.
+!
+! Unless required by applicable law or agreed to in writing, software
+! distributed under the License is distributed on an "AS IS" BASIS,
+! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+! See the License for the specific language governing permissions and
+! limitations under the License.
 
 #:include "common.fypp"