* gcc.c: Include "vec.h".
	(argbuf): Make into a VEC.
	(argbuf_length, argbuf_index): Remove.
	(alloc_args, clear_args, store_arg, execute, insert_wrapper,
	do_spec, do_self_spec, do_spec_1, eval_spec_function, main,
	compare_debug_dump_opt_spec_function: Use VEC interfaces on
	argbuf.
	* Makefile.in (GCC_OBJS): Add vec.o and ggc-none.o.
	(gcc.o): Depend on $(VEC_H).

From-SVN: r166788