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Relax detection of non-premultiplied alpha cursor data

Michel Dänzer requested to merge daenzer/xf86-video-amdgpu:relax-non-premul-alpha-cursor-detection into master

The stricter detection broke the cursor in some games. Apparently those use cursor data with premultiplied alpha, but with some pixels having r/g/b values larger than the alpha value (which corresponds to original r/g/b values > 1.0), triggering the workaround.

Relax the detection to match what's in the X server since 1.18.4, but keep the workaround for older versions.

Bugzilla: https://bugs.freedesktop.org/108650

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