Origin for each line in watchdogd.service.mk from check-in bc20f9df9f:

7a1e7f4a58 2019-10-21    1: DAEMON_watchdogd_COMMAND?=/usr/sbin/watchdogd
7a1e7f4a58 2019-10-21    2: DAEMON_watchdogd_ENABLE?=no
bc20f9df9f 2019-10-24    3: DAEMON_watchdogd_FOREGROUND?=-d
7a1e7f4a58 2019-10-21    4: 
7a1e7f4a58 2019-10-21    5: .if empty(:!sysctl -qn debug.watchdog || exit 0!)
7a1e7f4a58 2019-10-21    6: DAEMON_watchdogd_ENABLE=no
7a1e7f4a58 2019-10-21    7: .endif
7a1e7f4a58 2019-10-21    8: 
7a1e7f4a58 2019-10-21    9: watchdogd: _earlyservice