add minimal ctxtcall.h

[Louis. Lenders]

Changelog: add minimal ctxtcall.h

Hi, this is part of bug http://bugs.winehq.org/show_bug.cgi?id=13462, affects several .net apps. The whole patch that fixes the bug can be found here http://bugs.winehq.org/attachment.cgi?id=15775, but maybe better to wait send the rest, as patchwatcher will fail to patch the second part, as it needs stuff from this patch. So i'll send the rest when this one gets in. Info about IContextCallback is at http://bugs.winehq.org/attachment.cgi?id=15775



      
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