The code had been handling ordering sibling windows relative to each other,
including windows neither of which were child windows.  However, it wasn't
properly handling other relationships (e.g. cousins, nieces, uncles, etc.).

The reason this is complicated is that Cocoa keeps child windows in a fixed
relative order to their parent and siblings.  The normal -orderWindow:relativeTo:
method doesn't work.  One has to remove the children from the parent and re-add
them in the desired order.
Signed-off-by: Ken Thomases <ken@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>