swscale: fix crash with dithering due incorrect offset calculation.
ptrdiff_t can be 4 bytes, which leads to the next element being 4-byte
aligned and thus at a different offset than intended. Forcing 8-byte
alignment forces equal offset of dither16/32 on x86-32 and x86-64.
Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>
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