ntdll: Add a stub implementation of FSCTL_PIPE_IMPERSONATE that just impersonates the token of the current process.

[Robert Shearman]

---
  dlls/kernel32/tests/pipe.c |    8 --------
  dlls/ntdll/file.c          |    5 +++++
  2 files changed, 5 insertions(+), 8 deletions(-)
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