MacOS/iOS/tvOS build

GLTFLoader: support MSFT DDS texture sources (`MSFT_texture_dds`) #1099

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Run time

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Job	Run time
MacOS -> Pre-Checks	19s
MacOS -> iOS-Release	3m 6s
MacOS -> MacOS-Release	10m 9s
MacOS -> tvOS-Debug	2m 57s
MacOS -> MacOS-Debug	5m 49s
MacOS -> iOS-Debug	2m 54s
	25m 14s