libs: window: add gst_vaapi_window_vpp_convert_internal()
If a backend doesn't support specific format, we can use vpp for conversion and make it playing. This api is originated from GstVaapiWindowWayland and moved to GstVaapiWindow, so that GstVaapiWindowX11 could use it. https://bugzilla.gnome.org/show_bug.cgi?id=759533
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