e18805fbd0b42b0c689af985bfb7d5cc8148e49e
We used to set this, but this was dropped when shutdown got taught to get the target passed in from the regular PID 1. Let's readd this to make things more explanatory, and cover all grounds, since after all the target passed is in theory an optional part of the protocol between the regular PID 1 and the shutdown PID 1.
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