Win32/UWP build

Core: enable DXC on Mac; add Metal mesh shader test reference #1718

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Run time

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Job	Run time
Win10 -> Pre-checks	49s
Win10 -> Win10-Win32, Debug	36m 4s
Win10 -> UWP-x64, Release	15m 36s
Win10 -> Win10-Dev-x64, RelWithDebInfo	37m 20s
Win10 -> Win10-x64, Release	52m 19s
Win10 -> Win10-Ninja-x64, Debug	17m 48s
Win10 -> Win10-Win32, Release	48m 32s
Win10 -> Win10-x64, Debug	33m 46s
Win10 -> UWP-x64, Debug	9m 57s
Win10 -> MinGW-x64, Release	19m 13s
	4h 31m 24s