Emscripten build

Disable noisy OpenGL debug messages 131220 and 131140 #4409

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Run time

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Job	Run time
Linux -> Emscripten, Release	18m 52s
Linux -> Emscripten, Debug	16m 22s
MacOS -> Emscripten, Debug	9m 19s
Win10 -> Emscripten, Release	26m 26s
Win10 -> Emscripten, Debug	21m 12s
	1h 32m 11s