[SDL] my dither pt. 2

[Peter]

Howdy,

Can't help but flap my yap again.  I updated the dither code, so now it
works correctly.  There's still room for improvement, and the quality
will never get to the level of generating first and dithering second, but
it still has it's benefits (hopefully more than bragging rights, I think
it could be faster and less memory intensive).

Any and all feedback is welcome.

=Pete
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