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

diff --git a/coreutils/whoami.c b/coreutils/whoami.c
index 25757f6..156516f 100644
--- a/coreutils/whoami.c
+++ b/coreutils/whoami.c
@@ -9,7 +9,7 @@
 
 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
 
-#include "busybox.h"
+#include "libbb.h"
 
 /* This is a NOFORK applet. Be very careful! */