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d3d11videosink: Fix window creation failure when multiple windows are requested at once

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:fix-d3d11-race into master 
d3d11window: Protect registration/creation of WIN32 window

Querying existing window class info and creation of window object
should be protected since they are not thread safe.
d3d11videosink: Don't try to post error message by d3d11window self

The d3d11window isn't GstElement. To post error message, proxy it
to d3d11videosink instead.

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