Origin for each line in swap.init from check-in 47c6cc1171:

5062c9b6fc 2019-10-19    1: # vim:ft=make:
5062c9b6fc 2019-10-19    2: 
5062c9b6fc 2019-10-19    3: swap: savecore
47c6cc1171 2019-10-20    4: .if ${:!sysctl -n vm.swap_enabled!}} != 0
5062c9b6fc 2019-10-19    5: 	: Enabling swap.
5062c9b6fc 2019-10-19    6: 	swapon -a
5062c9b6fc 2019-10-19    7: .endif