ntoskrnl.exe: Add stub for IoUnregisterShutdownNotification (try3)

[Stefan Leichter]

Without the build failure from try2 this time
fixes http://bugs.winehq.org/show_bug.cgi?id=13448
---
 dlls/ntoskrnl.exe/ntoskrnl.c        |    9 +++++++++
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |    2 +-
 2 files changed, 10 insertions(+), 1 deletions(-)

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