[PATCH 3/7] dsound: Add mixing and normalization functions

[Maarten Lankhorst]

This implements 2 stage mixing. First all buffers are mixed to a bigger
temporary buffer, then that buffer is normalized to fit in the primary
device. This increases quality, and should increase speed too. The
mixing functions are added here. The mixing logic is touched in next
patch, because the patch would otherwise be too big.
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