* automake.in (handle_languages, handle_single_transform_list,

* automake.in (handle_languages, handle_single_transform_list,
lang_c_rewrite): Use require_conf_file instead of
require_config_file to require depcomp or compile from Makefile.am.
(require_aux_file_with_line): New function, adapted from
require_conf_gile_with_line.
(require_conf_file_with_line, require_conf_file_with_conf_line):
Simplify using require_aux_file_with_line.
(require_config_file): Simplify using require_conf_file_with_conf_line.
(require_conf_file): New function.