Add constants to and fix the dst 32 comments (#827)
The first set of rotates were commented as being Sin + Cos, Sin - Cos, and Cos instead of (Sin + Cos)/Sqrt(2), (Sin - Cos)*Sqrt(2), and Cos*Sqrt(2). The rest of the code has constants in their comments. The 32 point asym dst did not. This patch adds those constants.
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