* Makefile.in: Update.
	* common.opt: New options.
	* opts.c (maybe_warn_unused_parameter, set_Wextra, handle_param,
	set_Wunused): New.
	(common_handle_option): Handle new options.
	* toplev.c (set_target_switch): Export.
	(set_Wextra, set_Wunused, maybe_warn_unused_parameter): Move to opts.c.
	(decode_W_option): -Wunused and -Wextra handled in opts.c now.
	(independent_decode_option): More options handled in opts.c now.
	Change prototype.
	* toplev.h (set_target_switch): New.

From-SVN: r68138