cmake OPENSUBDIV_HAS_PTEX examples

PixarAnimationStudios/OpenSubdiv opensubdiv/CMakeLists.txt :457 

target_compile_definitions(${osd_target} INTERFACE OPENSUBDIV_HAS_PTEX)

lighttransport/tinyusdz src/osd/opensubdiv/CMakeLists.txt :429 

target_compile_definitions(${osd_target} INTERFACE OPENSUBDIV_HAS_PTEX)