cmake PBRT_HAVE_POSIX_MEMALIGN examples

mmp/pbrt-v4 CMakeLists.txt :509 

list (APPEND PBRT_DEFINITIONS "PBRT_HAVE_POSIX_MEMALIGN")

mmp/pbrt-v3 CMakeLists.txt :254 

ADD_DEFINITIONS ( -D PBRT_HAVE_POSIX_MEMALIGN )