Fix some licenses problem

.reuse/dep5

+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: kdebugsettings
+Upstream-Contact: Montel Laurent <montel@kde.org>
+Source: https://invent.kde.org/utilities/kdebugsettings
+
+Files: autotests/data/*.ini autotests/data/*.ref autotests/data/*.categories autotests/data/*.renamecategories
+Copyright: none
+License: CC0-1.0

Messages.sh

 #! /usr/bin/env bash
+# SPDX-FileCopyrightText: 2015 Montel Laurent <montel@kde.org>
+# SPDX-License-Identifier: BSD-3-Clause
 $XGETTEXT src/*.cpp -o $podir/kdebugsettings.pot

sanitizers.supp

+# SPDX-FileCopyrightText: 2021 Laurent Montel <montel@kde.org>
+# SPDX-License-Identifier: CC0-1.0
 # Suppression file for ASAN/LSAN
 
 leak:libspeechd