MacOS/iOS/tvOS build

Upgrade libpng to 1.6.55 #1054

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Run time

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Job	Run time
MacOS -> Pre-Checks	12s
MacOS -> MacOS-Debug	6m 57s
MacOS -> iOS-Release	3m 4s
MacOS -> iOS-Debug	2m 46s
MacOS -> MacOS-Release	6m 27s
MacOS -> tvOS-Debug	2m 22s
	21m 48s