shell32: conformance tests for unicode filenames and fix a bug for file deletion (try 3)

[Nigel Liang]

Hi,

Added changes suggested by Dmitry, Dan, Lei, and Paul
- Use a simpler unicode name in test, and comment more clearly what it is
- Added comment to explain why double-null termination is needed
- Change method of determining whether there is unicode support
- Check return value of pSHCreateDirectoryExW
- trace() -> skip()

Thanks,
--
 tests/shlfileop.c |   88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 xdg.c             |    4 +-
 2 files changed, 90 insertions(+), 2 deletions(-)
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