c-decl.c (define_label): Tidy.

c-decl.c (define_label): Tidy.

	* c-decl.c (define_label): Tidy.  Don't use any of
	error_with_file_and_line or warning_with_file_and_file.
	(pending_xref_error): Likewise.
	(store_parm_decls): Likewise.
	(current_function_prototype_locus): New object.  Package from
	current_function_prototype_file and current_function_prototype_line.
	(start_function): Use it.
	(current_function_prototype_file): Remove.
	(current_function_prototype_line): Remove;

From-SVN: r66599