server: Make create_mutex use struct object_attributes and set the security descriptor of mutex objects.

[Robert Shearman]

---
  dlls/ntdll/sync.c   |   20 +++++++++++++++++---
  server/mutex.c      |   24 ++++++++++++++++++++----
  server/protocol.def |    3 +--
  3 files changed, 38 insertions(+), 9 deletions(-)

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