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Fix reading gamma from PNGs without ICC profile

Andreas Sturmlechner requested to merge asturmlechner/qtbase:png-icc-gamma-fix into kde/5.15

The decoding of PNG_INFO_gAMA to QColorSpace was incorrect, the PNG gamma is the inverse of the gamma value we use. We revert it everywhere else, just not here.

BUG: 420357 Pick-to: 6.2 5.15 Change-Id: Ic0ae1963b2dde3004cac8a6430ddaf99e7096915 Reviewed-by: Eirik Aavitsland eirik.aavitsland@qt.io (cherry picked from commit de2c3ccd)

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