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 e9c0a38f
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 607dce96
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>