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

diff --git a/networking/nslookup.c b/networking/nslookup.c
index 424a0e4..608e654 100644
--- a/networking/nslookup.c
+++ b/networking/nslookup.c
@@ -12,7 +12,7 @@
  */
 
 #include <resolv.h>
-#include "busybox.h"
+#include "libbb.h"
 
 /*
  *  I'm only implementing non-interactive mode;