add WGL_NV_DX_interop2 support to handle D3D11 decoding in the OpenGL vout

Right now we are limited to DXVA2 interoperability which is not the default on most computers we support in 4.0 so there's always the need to convert to CPU because we can use the OpenGL vout.

It shouldn't be too much work to support NV_DX_interop2 in the same way we support WGL_NV_DX_interop for DVXA2.

No idea about driver support among manufacturers though.

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