Add LGPL header as requested by Oded.

Originally committed as revision 8126 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/libnut.c

+/*
+ * NUT (de)muxing via libnut
+ * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
 #include "avformat.h"
 #include "riff.h"
 #include <libnut.h>