gst: set the unset flag on Buffers fields
These buffer fields are unset so set the flag accordingly. In 0.2 this didn't really negotiate to a common set of parameters but that was then ignored and a default set of params was used and things worked. In the compat layer, however, this causes problems because a failed negotiation will now result in an error. Setting the unset flag is the right thing to do but we might have to do a workaround on the server to support the old broken definition.
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