Origin for each line in swap.init.mk from check-in 7a1e7f4a58:

7a1e7f4a58 2019-10-21    1: swap: savecore
7a1e7f4a58 2019-10-21    2: .if ${:!sysctl -n vm.swap_enabled!}} != 0
7a1e7f4a58 2019-10-21    3: 	echo "MRC:$@> Enabling swap."; \
7a1e7f4a58 2019-10-21    4: 	swapon -a
7a1e7f4a58 2019-10-21    5: .endif