vec.h (VEC_T_length, [...]): Use unsigned, not size_t.

vec.h (VEC_T_length, [...]): Use unsigned, not size_t.

	* vec.h (VEC_T_length, VEC_T_index, VEC_T_iterate, VEC_T_truncate,
	VEC_T_replace, VEC_T_quick_insert, VEC_T_safe_insert,
	VEC_T_ordered_remove, VEC_T_unordered_remove): Use unsigned, not
	size_t.
	(struct VEC): Use unsigned for num and alloc.
	* vec.c (struct vec_prefix): Likewise.
	(vec_o_reserve): Adjust.

From-SVN: r84973