shlwapi/tests: test UrlUnEscape inplace behavior (1/2) (try 2)

[Dan Kegel]

Add test showing UrlUnEscape should convert the url in place
when URL_UNESCAPE_INPLACE is set, even if the output buffer is NULL.
Passes on XP.

Changes since originally posted by Louis Lenders as
http://www.winehq.org/pipermail/wine-patches/2008-August/059567.html
1) added todo_wine around parts that fail in Wine
2) he has requested that somebody else take it over,
so I am raising my hand.

This is related to Google Lively installer,
http://bugs.winehq.org/show_bug.cgi?id=14381
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