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

diff --git a/miscutils/watchdog.c b/miscutils/watchdog.c
index 28ae9bd..b64291b 100644
--- a/miscutils/watchdog.c
+++ b/miscutils/watchdog.c
@@ -8,7 +8,7 @@
  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  */
 
-#include "busybox.h"
+#include "libbb.h"
 
 #define OPT_FOREGROUND 0x01
 #define OPT_TIMER      0x02