fix: text rendering did not work correctly with alpha #3934
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As render text with shadow with channel alpha, I don't get the same result that without channel alpha.
Without channel alpha, shadow option permit to draw a dilated text in black, whereas with channel alpha, OIIO makes a gap...
Working with dev-2.2 branch, I can see the same issue on master branch.
In using this patch, shadow option works as expected on image with alpha buffer.
Ref: #3932
[Note]: OpenImageIO is used in the gpx2video project.