user32: Add tests for DefWindowProc processing the undocumented 0x3B message.

[Robert Shearman]

---
  dlls/user32/tests/msg.c |   71 
+++++++++++++++++++++++++++++++++++++++++++++++
  1 files changed, 71 insertions(+), 0 deletions(-)

Found from observations with Spy++ whilst testing log-off behaviour in 
XP. I don't see any point in using this message type over the documented 
messages though.
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