server: Make create_mapping use struct object_attributes and set the security descriptor of file mapping objects.

[Robert Shearman]

---
  dlls/ntdll/ntdll_misc.h |    5 +++++
  dlls/ntdll/sync.c       |   21 +++++++++++----------
  dlls/ntdll/virtual.c    |   16 +++++++++++++++-
  server/mapping.c        |   24 ++++++++++++++++++++----
  server/protocol.def     |    3 +--
  5 files changed, 52 insertions(+), 17 deletions(-)
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