advapi32: Implement SetFileSecurityW on top of NtSetSecurityObject. [Try 2]

[Robert Shearman]

---
  dlls/advapi32/security.c |   25 +++++++++++++++++++++++--
  1 files changed, 23 insertions(+), 2 deletions(-)

The call to CreateFileW should pass the FILE_FLAG_BACKUP_SEMANTICS flag 
so that it works on directories too (spotted by Dmitry).
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