cmake HAVE_READ_REAL_TIME examples

arkdb/inception configure.cmake :542

CHECK_FUNCTION_EXISTS(read_real_time HAVE_READ_REAL_TIME)

alibaba/AliSQL configure.cmake :649

CHECK_FUNCTION_EXISTS(read_real_time HAVE_READ_REAL_TIME)

Tokutek/mysql-5.5 configure.cmake :465

CHECK_FUNCTION_EXISTS(read_real_time HAVE_READ_REAL_TIME)