ntdll: The FileMailslotSetInformation and FileCompletionInformation cases of NtSetInformationFile don't need the fd.

[Robert Shearman]

So don't do an extra server call to get the fd to avoid a performance 
penalty and to make these cases work when an fd isn't available.
---
  dlls/ntdll/file.c |   19 +++++++++++++++----
  1 files changed, 15 insertions(+), 4 deletions(-)
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