x86/dsputil: Fix author attribution after code has been moved/splited around

x86/dsputil: Fix author attribution after code has been moved/splited around

Reference:
commit 3615e2be846f6382aa42360d02d16b25f443af9f
Author: Michael Niedermayer <michaelni@gmx.at>
Date:   Tue Dec 2 22:02:57 2003 +0000

    h263_h_loop_filter_mmx

    Originally committed as revision 2553 to svn://svn.ffmpeg.org/ffmpeg/trunk

commit 359f98ded95ec65f7109b25f3cfaa9189c4fab9c
Author: Michael Niedermayer <michaelni@gmx.at>
Date:   Tue Dec 2 20:28:10 2003 +0000

    h263_v_loop_filter_mmx

    Originally committed as revision 2552 to svn://svn.ffmpeg.org/ffmpeg/trunk

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