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compositor: fix off-by-1 error in blending ARGB

Jan Schmidt requested to merge thaytan/gst-plugins-base:compositor-blend-off-by-one-fixes into master

Use a more naive blend formulation that avoids off-by-one errors at the 0x00 and 0xff alpha endpoints.

Fixes #810

This simpler formulation of alpha blending adds an extra multiply into the loop, but it doesn't seem to affect performance much on modern hardware.

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