* defs.h (do_exec_error_cleanups, discard_exec_error_cleanups)

	* defs.h (do_exec_error_cleanups, discard_exec_error_cleanups)
	(make_exec_error_cleanup): Remove declarations.
	* utils.c (exec_error_cleanup_chain): Remove.
	(do_exec_error_cleanups, discard_exec_error_cleanups)
	(make_exec_error_cleanup): Remove.
	* event-loop.c (start_event_loop): Adjust call to
	async_enable_stdin.
	* event-top.c (async_enable_stdin): Remove the paramater dummy.
	(async_disable_stdin): Don't register async_enable_stdin via
	cleanup.
	* inf-loop.c (inferior_event_handler): Don't
	call do_exec_error_cleanups.  Call async_enable_stdin instead.
	* event-loop.c (start_event_loop): Adjust call to
	async_enable_stdin.
	* tui/tui-interp.c (tui_command_loop): Adjust call to
	async_enable_stdin.