msdk: add support for Windows D3D
Submitted by Andy Devar
MSDK plugin currently does not support Windows. Important parts of the implementation are missing, e.g. gstmsdkallocator_d3d.c.
With some effort (remove va code files, add gstreamer property sheets and Intel Media SDK include & lib directories), it is possible to compile the module using Visual Studio. But the resulting DLL won't work on Windows because of the missing implementation.