shlwapi/tests: test UrlUnEscape inplace behavior (1/2) (try 3)

[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.
Needed by Lively, http://bugs.winehq.org/show_bug.cgi?id=14381

Changes since originally posted by Louis:
1) added todo_wine around parts that fail in Wine
2) added original From: line as requested by Alexandre
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