kernel32: WideCharToMultiByte: test negative dest len (take 3)

[Dan Kegel]

While investigating a crash in gs-auftrag in bug 9039, noticed
WideCharToMultiByte wasn't quite conformant for negative destlen.

As Alexandre pointed out, and as I would have seen if I had
bothered to run the wine test suite, actually fixing this bug would
require fixing a bunch of callers (e.g. by changing -1 to INT_MAX).
So for now here's the test alone without the fix, properly todo_wine'd.
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