Relicense to LGPL and add standard license header.

Approved by the author, Sebastien Bechet, over email.

Originally committed as revision 8188 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/rotozoom.c

 /*
  * Generates a synthetic YUV video sequence suitable for codec testing.
- * GPLv2
- * rotozoom.c -> s.bechet@av7.net
+ *
+ * copyright (c) Sebastien Bechet <s.bechet@av7.net>
+ *
+ * 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 <stdlib.h>
 #include <stdio.h>
 #include <inttypes.h>