Fix stack blowout in _w95_dump_dke

[by way of Troy Rollo <troy at corvu.com.au> by way of Troy Rollo <troy at corvu.com.au>]

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_w95_dump_dke uses recursion to process sibling keys, thereby leading to 
exhaustion of the stack in registry keys with large numbers of children (such 
as Software\CLASSES). Discussed on wine-devel with nobody offering a reason 
why the keys need to be processed in the order suggested by the recursion.

This patch causes sibling keys to be processed iteratively, thereby preventing 
exhaustion of the stack.
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