cmake DOPENSUBDIV_HAS_CLEW examples

PixarAnimationStudios/OpenSubdiv CMakeLists.txt :563 

add_definitions(
            -DOPENSUBDIV_HAS_CLEW
        )

lighttransport/tinyusdz src/osd/CMakeLists.txt :541 

add_definitions(
            -DOPENSUBDIV_HAS_CLEW
        )