CMake: use SPIRV-Headers target instead of DILIGENT_SPIRV_HEADERS_DIR variable (DiligentGraphics/DiligentEngine#40)
CMake: use SPIRV-Headers target instead of DILIGENT_SPIRV_HEADERS_DIR variable (DiligentGraphics/DiligentEngine#40)

DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore