user32: Handle the undocumented behaviour in DefWindowProc for WM_NCACTIVATE that causes the nonclient area not to be redrawn.

[Robert Shearman]

If the lParam is 0xffffffff then the nonclient area is not redrawn.
---
  dlls/user32/controls.h  |    2 +-
  dlls/user32/defwnd.c    |    2 +-
  dlls/user32/nonclient.c |   16 +++++++++++-----
  3 files changed, 13 insertions(+), 7 deletions(-)

Outlook 2007 depends on this undocumented behaviour. I don't know if 
this behaviour was always present, but it is at least on XP SP2.
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