* library/targetselection.itb (init_target_db): Add comment

	* library/targetselection.itb (init_target_db): Add comment
	about "arguments" vs "options" on native debuggers.
	(build_win): If the target is "default", choose "Exec" for native
	debuggers. For cross debuggers, let the user choose.
	(write_saved): For exec targets, save target options to gdb via
	gdb_set_inferior_args.
	(config_dialog): For "exec" targets, save gdb's stored arguments
	into the options preference.