Emscripten build

Upgrade zlib to 1.3.2 #1050

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Run time

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Job	Run time
Linux -> Emscripten, Debug	14m 41s
Win10 -> Emscripten, Debug	20m 8s
Win10 -> Emscripten, Release	21m 0s
Linux -> Emscripten, Release	16m 9s
MacOS -> Emscripten, Debug	12m 35s
	1h 24m 33s