usage.c: remove reference to busybox.h
*: s/include "busybox.h"/include "libbb.h"

diff --git a/networking/nameif.c b/networking/nameif.c
index ec77512..a65f308 100644
--- a/networking/nameif.c
+++ b/networking/nameif.c
@@ -9,7 +9,7 @@
  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  */
 
-#include "busybox.h"
+#include "libbb.h"
 #include <syslog.h>
 #include <net/if.h>
 #include <netinet/ether.h>