This uses StartExecEx to get the equivalent of ExecStart=:. StartExecEx was
added in b3d593673c, so this will not work with
older systemds.
A hint is emitted if we get an error indicating lack of support. PID1 returns
SD_BUS_ERROR_PROPERTY_READ_ONLY, but I'm checking for
SD_BUS_ERROR_UNKNOWN_PROPERTY too for safety.
System and Service Manager
Details
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