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Right now, we never install destination matches on kdbus as the kernel did not support MATCH rules on those. With the introduction of KDBUS_ITEM_DST_ID we can now match on destination IDs, so add explicit support for those. This requires a recent kdbus module to work. However, there seems to be no user-space that uses "Destination=''" matches, yet, so old kdbus modules still work fine (we couldn't find any real user). This is needed to match on unicast signals in bus-proxy. A followup will add support for this.