server: Make create_semaphore use struct object_attributes and set the security descriptor of semaphore objects.

[Robert Shearman]

---
  dlls/ntdll/sync.c   |   16 +++++++++++++++-
  server/protocol.def |    3 +--
  server/semaphore.c  |   24 ++++++++++++++++++++----
  3 files changed, 36 insertions(+), 7 deletions(-)

tools/make_requests needs to be run after applying this patch.
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