Use -HV 2021 for DXC on PC when available #247
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We were already using HLSL 2021 for Xbox GDK scenarios. This PR opts-in for HLSL 2021 when building for PC except on known versions of DXC.EXE that don't support it.
Updates the CompileShaders batch to use
LegacyShaderCompilerenvironment variable if defined for older shader scenarios, and updates the CMake to set it based on find_program logic.