cmake HAVE_PTHREAD_SPIN_LOCK examples

mixxxdj/mixxx lib/libshout-idjc/CMakeLists.txt :197 

check_symbol_exists(pthread_spin_init "sys/time.h" HAVE_PTHREAD_SPIN_LOCK)

mixxxdj/mixxx lib/libshout-idjc/CMakeLists.txt :199 

add_compile_definitions(HAVE_PTHREAD_SPIN_LOCK)