ipfw: fix build

Buildbot reported:
 runmode-ipfw.c: In function 'RunModeIpsIPFWAuto':
 runmode-ipfw.c:85: error: implicit declaration of function 'LiveDeviceHasNoStats'

src/runmode-ipfw.c

@@ -46,6 +46,7 @@
 #include "util-affinity.h"
 #include "util-runmodes.h"
 #include "source-ipfw.h"
+#include "util-device.h"
 
 static const char *default_mode;