Cleanup of per-input global variables in automake.in. * automake.in ($output_vars, $output_all, $output_header) ($output_rules, $output_trailer): Fix comment, and sort declarations in the order they will appear in the output. ($all_target): Unused variable, remove. (Variables not reset by &initialize_per_input.): New section, clarify that %am_file_cache is not reset. (initialize_per_input): Reset $am_file_name, $am_relative_dir, $in_file_name, $relative_dir, and $topsrcdir to `undef' rather than the empty string; $topsrcdir was not reset at all. Sort remaining variables in the same order as in the section `Variables reset by &initialize_per_input'. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>