cmake DOPENSUBDIV_HAS_OPENCL examples

PixarAnimationStudios/OpenSubdiv CMakeLists.txt :559 

add_definitions(
        -DOPENSUBDIV_HAS_OPENCL
    )

lighttransport/tinyusdz src/osd/CMakeLists.txt :537 

add_definitions(
        -DOPENSUBDIV_HAS_OPENCL
    )