Lines of swap.init from check-in 5062c9b6fc that are changed by the sequence of edits moving toward check-in 47c6cc1171:

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