x86/cavsdsp: fix buffer alignment in cavs_idct8_add_mmx()

It may be used by ff_add_pixels_clamped_sse2().
Should fix fate-cavs failures on some systems.

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>
avcodec/svq1enc: align buffer used by simd functions

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>
lavc/x86/idctdsp.h: Fix make checkheaders.
avcodec/dxtory: Support dxtory-2.0.127.avi

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