shell32: conformance tests for unicode filenames and fix a bug for file deletion

[Nigel Liang]

Hi,

Changelog:
- Conformance tests for files and directories with unicode filenames
- Fix a bug for deletion of files with unicode filenames that causes crash

--
  tests/shlfileop.c |   83
++++++++++++++++++++++++++++++++++++++++++++++++++++++
  xdg.c             |    4 +-
 2 files changed, 85 insertions(+), 2 deletions(-)