user32: Implement GetListBoxInfo()

[Nikolay Sivov]

Test shows that this call works for subclassed listbox too and no 
message is sent. I tried to call it for a different window setting data 
pointer to invalid pointer value and it doesn't crash a test, just 
returns 0. I also tried to create listbox with non-default window class 
name and it still works, so I'm not sure how it does that, maybe it just 
has exception handler around internal listbox procedure call. For now a 
test is a reminder that it doesn't match what native does internally.
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