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

diff --git a/archival/dpkg.c b/archival/dpkg.c
index 7d31ad1..dcbd0d1 100644
--- a/archival/dpkg.c
+++ b/archival/dpkg.c
@@ -24,7 +24,7 @@
  *
  */
 
-#include "busybox.h"
+#include "libbb.h"
 #include "unarchive.h"
 
 /* note: if you vary hash_prime sizes be aware,