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gl: Rollback behaviour change in GstGLDummyWindow

Thibault Saunier requested to merge thiblahute/gst-plugins-base:dummy_surface into master

Making it advertised itself as "has_output_surface" as this is the assumption the code was making before that vmethod was added.

Add a subclass of GstGLWindow that is always used for the new GstGLDisplayEGLDevice display type instead of requiring a GstGLDummyWindow to be used in that case and this subclass marks itself as not having output surface. Technically we could have returned NULL in GstGLDisplay::create_window vmethod, but all the code makes the assumption this vmethod returns something.

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