Check if WDT_DEVNODE is defined, may not be enabled in configure

When this code was moved from finit.c we rely on WDT_DEVNODE to be
defined in config.h, which is controlled by configure.  Meaning, before
the relocation, Finit did not honor the configure settings.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/conf.c

@@ -1212,11 +1212,12 @@ int conf_init(uev_ctx_t *ctx)
 	/*
 	 * Start built-in watchdogd as soon as possible, if enabled
 	 */
+#ifdef WDT_DEVNODE
 	if (whichp(FINIT_LIBPATH_ "/watchdogd") && fexist(WDT_DEVNODE)) {
 		service_register(SVC_TYPE_SERVICE, "[S123456789] cgroup.init name:watchdog :finit " FINIT_LIBPATH_ "/watchdogd -- Finit watchdog daemon", global_rlimit, NULL);
 		wdog = svc_find("watchdog", "finit");
 	}
-
+#endif
 	/*
 	 * Start kernel event daemon as soon as possible, if enabled
 	 */

src/finit.c

@@ -59,7 +59,6 @@
 #include "util.h"
 #include "utmp-api.h"
 #include "schedule.h"
-#include "watchdog.h"
 
 int   runlevel  = 0;		/* Bootstrap 'S' */
 int   cfglevel  = RUNLEVEL;	/* Fallback if no configured runlevel */