winnt.h: Added activation context structures declarations. [try 2]

[Jacek Caban]

I had this patch in two commits in my local GIT. Last time I
accidentally sent one of them instead of merging them first.
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 include/winnt.h |   80
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 80 insertions(+), 0 deletions(-)
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