server: Track handle count

[Andrew Cook]

Allows tools using NtQueryObject to see the number of handles
to an object in addition to the number of references.

Will be required for the kill on close limit for job objects.
---
 dlls/ntdll/om.c     |  2 +-
 server/handle.c     |  9 +++++----
 server/object.c     | 18 ++++++++++++++++++
 server/object.h     |  3 +++
 server/protocol.def |  1 +
 5 files changed, 28 insertions(+), 5 deletions(-)


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