Convert two remaining copyright statements to SPDX

1a265138 · Volker Krause · 3dc8548f · 1a265138 · 1a265138
Commit 1a265138 authored Aug 16, 2020 by Volker Krause
--- a/src/kmime_contentindex.cpp
+++ b/src/kmime_contentindex.cpp
 /*
-    Copyright (c) 2006 - 2007 Volker Krause <vkrause@kde.org>
+    SPDX-FileCopyrightText: 2006-2007 Volker Krause <vkrause@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
 */

--- a/src/kmime_contentindex.h
+++ b/src/kmime_contentindex.h
 /*
-    Copyright (c) 2006 - 2007 Volker Krause <vkrause@kde.org>
+    SPDX-FileCopyrightText: 2006-2007 Volker Krause <vkrause@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
 */