SDL: Relicensed testutils to match other test code

SDL Commits
1 
From 6c2472d459602eb3c3ee109d6e8f255336109673 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 12 Jul 2023 09:53:52 -0700
Subject: [PATCH] Relicensed testutils to match other test code

Permission granted in https://github.com/libsdl-org/SDL/commit/76a7b629bfc4869df7659c2f2e47d9253c73696f#commitcomment-121408342
---
 test/testutils.c | 13 ++++++++++---
 test/testutils.h | 13 ++++++++++---
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/test/testutils.c b/test/testutils.c
index d88643159068..f49b38e1c4fb 100644
--- a/test/testutils.c
+++ b/test/testutils.c
@@ -1,7 +1,14 @@
 /*
-Copyright 1997-2023 Sam Lantinga
-Copyright 2022 Collabora Ltd.
-SPDX-License-Identifier: Zlib
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+  Copyright 2022 Collabora Ltd.
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely.
 */
 
 #include "testutils.h"
diff --git a/test/testutils.h b/test/testutils.h
index 42dfa40698bb..614d6b53ba8f 100644
--- a/test/testutils.h
+++ b/test/testutils.h
@@ -1,7 +1,14 @@
 /*
-Copyright 1997-2023 Sam Lantinga
-Copyright 2022 Collabora Ltd.
-SPDX-License-Identifier: Zlib
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+  Copyright 2022 Collabora Ltd.
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely.
 */
 
 #ifndef TESTUTILS_H