(with_echo_area_buffer): Take additional EMACS_INT
parameters instead of using int parameters. Expect FN to accept
EMACS_INT parameters.
(display_echo_area, resize_echo_area_axactly, current_message)
(truncate_echo_area, set_message_1): Call with_echo_area_buffer
with new argument list.
(resize_mini_window_1): New callback function.
(current_message_1, truncate_message_1, set_message_1): Change
parameter lists to the new format expected by
with_echo_area_buffer.