add a generator to pull rc-local.service in
rc-local.service acts as an ordering barrier even if its condition is false, because conditions are evaluated when the service is about to be started. To avoid the ordering barrier in a legacy-free system, add a generator to pull rc-local.service into the transaction only if the script is executable. If/when we rewrite SysV compatibility into a generator, this one can become a part of it.
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