Emscripten build

Add missing thread include to ParsingEnvironment #1156

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Run time

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Job	Run time
Win10 -> Emscripten, Debug	20m 48s
Linux -> Emscripten, Debug	15m 9s
MacOS -> Emscripten, Debug	10m 4s
Win10 -> Emscripten, Release	21m 46s
Linux -> Emscripten, Release	14m 15s
	1h 22m 2s