add ctxtcall.idl (4th resend)

[Louis. Lenders]

4th resend. If the patch is wrong, could you just tell me what's wrong with it? Might be handier, then me having to guess what's wrong...

Needed to get bug #13462 fixed. Followup of this patch is attached to the bug here http://bugs.winehq.org/attachment.cgi?id=16397


      
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