Avoid using file_stat in libinterp/corefcn (bug #59711). * dirfnc.cc (F__mkdir__), file-io.cc (do_stream_open), graphics.cc (Fdrawnow), interpreter.cc (interpreter::execute_startup_files), load-path.cc (load_path::find_file, load_path::find_dir, load_path::find_matching_dirs, load_path::find_first_of, load_path::find_all_first_of, load_path::execute_pkg_add_or_del, load_path::add, load_path::find_private_file, load_path::dir_info::get_file_list, load_path::dir_info::get_method_file_map, genpath), load-save.cc (find_file_to_load), ls-mat5.cc (read_mat5_binary_element), urlwrite (Furlwrite), utils.cc (find_data_file_in_load_path, fcn_file_in_path), __ftp__.cc (F__ftp_mput__), __magick_read__.cc (F__magick_write__): Use functions "dir_exists" or "file_exists" instead of "file_stat".