Test that runs through a fairly large combination of the various
termios speed functions, for the new speed_t interface, for the old
speed_t interface (if enabled), and for the new baud_t interface.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
