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d3d11window: Fix possible deadlock when drawing on external window handle

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11window-race-condition into master 
d3d11window_win32: Create internal window on parent window's thread

If parent and child windows are running on different thread,
there is always a chance to cause deadlock as DefWindowProc() call
from child window thread might be blocked until the message
is handled by parent's window procedure.
d3d11window: Add unprepare method to clear internal resource

GObject::dispose method can be called multiple times. As win32 d3d11window
has an internal thread and because GObject::dispose method could be called from the
thread, it might cause problems such as trying to join self-thread

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