(x_connection_signal): Call x_connection_closed properly.
(x_connection_closed): Set FRAME_X_DISPLAY to 0. (x_destroy_window): Don't do any X operations if FRAME_X_DISPLAY is 0. (x_term_init): Use "" as 2nd arg to setlocale. (x_connection_signal): Don't stop polling. Don't mess with SIGALRM. Those were relics of the superseded Dec 19 change.
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