cmake HAVE_THR_YIELD examples

alibaba/AliSQL configure.cmake :609 

CHECK_FUNCTION_EXISTS (thr_yield HAVE_THR_YIELD)

arkdb/arkproxy configure.cmake :409 

CHECK_FUNCTION_EXISTS (thr_yield HAVE_THR_YIELD)

alibaba/AliSQLBackup configure.cmake :524 

CHECK_FUNCTION_EXISTS (thr_yield HAVE_THR_YIELD)