urlmon: [Patch 1] Implement CreateZoneEnumerator, GetZoneAt, DestroyZoneEnumerator [try 3]

[Detlef Riekenberg]

This time, we don't care about dwEnum.
That value is returned from CreateZoneEnumerator and
checked only in GetZoneAt and DestroyZoneEnumerator.

Windows has only the Zones "0" upto "4" since IE4.0
and no UI to add or remove a Zone.
Tracking the status is useless, as the abailable Zones
are always the same.

This fixes bug 15461:
http://bugs.winehq.org/show_bug.cgi?id=15461


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By by ... Detlef