cmake HAVE_PTHREAD_THREADMASK examples

arkdb/inception configure.cmake :453 

CHECK_FUNCTION_EXISTS (pthread_threadmask HAVE_PTHREAD_THREADMASK)

alibaba/AliSQL configure.cmake :560 

CHECK_FUNCTION_EXISTS (pthread_threadmask HAVE_PTHREAD_THREADMASK)

Tokutek/mysql-5.5 configure.cmake :393 

CHECK_FUNCTION_EXISTS (pthread_threadmask HAVE_PTHREAD_THREADMASK)