Make iolist_size() work for iolists containing non-pure lists.
Make iolist_size() work for iolists containing non-pure lists.

csae1152/erjang,trifork/erjang,csae1152/erjang,csae1152/erjang,csae1152/erjang,trifork/erjang,trifork/erjang,csae1152/erjang,trifork/erjang,trifork/erjang,trifork/erjang,trifork/erjang