contrib: png: update to libpng 1.6.44

N.B. scripts/genout.cmake.in was moved to scripts/cmake/genout.cmake.in

changed milestone to %4.0

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added 13 commits

• def4bd9a...144757e5 - 12 commits from branch videolan:master
• 04f140a9 - contrib: png: update to libpng 1.6.44

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enabled an automatic merge when all merge checks for 04f140a9 pass

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merged