[Patch (Newb)]:libstdc++v3/tr1/array: Fix cast in array::end const so that it matches the return type of const_interator.

[Benjamin Kosnik]

>Problem is that the reinterpret_cast performed by member function
>array::end const is a cast to an iterator type. The  return type of
>array::end const is of type const_interator. The patch fixes this so
>that the cast and the return type match.

Thanks, this is in.

best,
benjamin