KERNEL32: ReadDirectoryChangesW fixes

[Mike McCormack]

ChangeLog:
ReadDirectoryChangesW remembers whether it's recording changes or not.
Don't initialize overlapped->InternalHigh.
The hEvent is cleared when ReadDirectoryChanges is called.

  dlls/kernel/change.c   |   14 +++++++++++++-
  dlls/ntdll/directory.c |    1 +
  server/change.c        |   37 ++++++++++++++++++++++++-------------
  server/protocol.def    |    1 +
  4 files changed, 39 insertions(+), 14 deletions(-)

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