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	we have those structures, but *don't* define them if we have
	TERMIOS, whose functions take care of those parameters; that
	screws up AIX.
	(struct emacs_tty): Test those symbols, instead of the ioctl
	commands.
	* sysdep.c (emacs_get_tty, emacs_set_tty, new_ltchars, new_tchars,
	init_sys_modes): Same.