x86/hpeldsp: Fix author attribution

This also fixes the project name

Original authors fabrice and nick go back to the initial ffmpeg commit
Others for example contributed in: (for a complete list please use git blame / show / log)

commit e9c0a38ff0
Author: Zdenek Kabelac <kabi@informatics.muni.cz>
Date:   Tue May 28 16:35:58 2002 +0000

    * optimized avg_* functions (except xy2)
    * minor speedup for put_pixels_x2 & cleanup

    Originally committed as revision 619 to svn://svn.ffmpeg.org/ffmpeg/trunk

commit 607dce96c0
Author: Michael Niedermayer <michaelni@gmx.at>
Date:   Fri May 17 01:04:14 2002 +0000

    hopefully faster mmx2&3dnow MC

    Originally committed as revision 506 to svn://svn.ffmpeg.org/ffmpeg/trunk

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/x86/hpeldsp.asm

@@ -1,20 +1,26 @@
 ;******************************************************************************
+;*
+;* Copyright (c) 2000-2001 Fabrice Bellard <fabrice@bellard.org>
+;* Copyright (c)      Nick Kurshev <nickols_k@mail.ru>
+;* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
+;* Copyright (c) 2002 Zdenek Kabelac <kabi@informatics.muni.cz>
+;*
 ;* MMX optimized hpel functions
 ;*
-;* This file is part of Libav.
+;* This file is part of FFmpeg.
 ;*
-;* Libav is free software; you can redistribute it and/or
+;* 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.
 ;*
-;* Libav is distributed in the hope that it will be useful,
+;* 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 Libav; if not, write to the Free Software
+;* License along with FFmpeg; if not, write to the Free Software
 ;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 ;******************************************************************************