Some bug fixes, plus a complete rewrite of source file handling:

Some bug fixes, plus a complete rewrite of source file handling:
	* texinfos.am (install-info-am): Handle case where INFO_DEPS is
	empty.  Reported by Andrew Cagney.
	(uninstall-info): Likewise.
	(dist-info): Likewise.
	* automake.in (handle_texinfo): Error if user tries to generate
	HTML.
	* automake.in (do_one_clean_target): Don't push previous clean
	target if this target is `mostly'.  Report from Raja R Harinath.
	* subdirs.am (mostlyclean-recursive ...): Build local_target, not
	target.  From Raja R Harinath.
	Completely changed how languages and source files are handled:
	* automake.in: Call register_language for each language.
	(lang_c_rewrite): New function.
	(lang_cxx_rewrite): Likewise.
	(lang_header_rewrite): Likewise.
	(lang_yacc_rewrite): Likewise.
	(lang_yaccxx_rewrite): Likewise.
	(lang_lex_rewrite): Likewise.
	(lang_lexxx_rewrite): Likewise.
	(lang_asm_rewrite): Likewise.
	(lang_fortran_rewrite): Likewise.
	(register_language): Likewise.
	(extension_map): New global.
	(language_map): Likewise.
	(resolve_linker): New function.
	(handle_single_transform_list): Rewrote to use lang_X_rewrite
	functions.  Changed meaning of first argument.
	(initialize_per_input): Removed seen_any_source.  Initialize
	language_scratch, extension_seen.  Removed cxx_extensions,
	seen_c_source, dir_holds_headers, dir_holds_sources.
	(handle_source_transform): Don't compute $objpat.  Pass $obj
	directly to handle_single_transform_list.
	(handle_built_sources): Fixed call to
	handle_single_transform_list.
	(lang_c_finish): New function.
	(lang_cxx_finish): Likewise.
	(lang_header_finish): Likewise.
	(lang_yacc_finish): Likewise.
	(lang_yaccxx_finish): Likewise.
	(lang_lex_finish): Likewise.
	(lang_lexxx_finish): Likewise..
	(lang_asm_finish): Likewise.
	(lang_fortran_finish): Likewise.
	(yacc_lex_finish_helper): Likewise.
	(libtool_compiler): Likewise.
	(saw_extension): New function.
	(handle_lib_objects_cond): Use saw_extension, not old variables.
	(handle_yacc_lex_cxx): Removed.
	(finish_languages): New function.
	(get_object_extension): Don't set dir_holds_sources.
	(handle_headers): Don't set dir_holds_headers.  Instead, call
	saw_extension.
	(saw_sources_p): New function.
	(handle_tags): Use it.
	(handle_dependencies): Likewise.
	(cxx_extensions): New function.
	(handle_dependencies): Use it.
	(generate_makefile): Call finish_languages, not
	handle_yacc_lex_cxx.