curlbasesink: Add curl seek callback
Adding functionality to handle SEEK_SET enables rewinding of sent data. In the HTTP case, this happens after an HTTP 401 has been received from the other end. This will result in the sent data being resent.
Adding functionality to handle SEEK_SET enables rewinding of sent data. In the HTTP case, this happens after an HTTP 401 has been received from the other end. This will result in the sent data being resent.