initctl: add companion delete command

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

src/serv.h

@@ -30,6 +30,7 @@ int serv_disable (char *arg);
 int serv_touch   (char *arg);
 int serv_edit    (char *arg);
 int serv_creat   (char *arg);
+int serv_delete  (char *arg);
 
 #endif /* FINIT_SERV_H_ */