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

diff --git a/init/init.c b/init/init.c
index 342e0a6..3dcd072 100644
--- a/init/init.c
+++ b/init/init.c
@@ -9,7 +9,7 @@
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include "busybox.h"
+#include "libbb.h"
 #include <paths.h>
 #include <signal.h>
 #include <sys/ioctl.h>