Standardize on the vi editing directives being on the first line.
diff --git a/scripts/usage.c b/scripts/usage.c
index 06f059a..373642c 100644
--- a/scripts/usage.c
+++ b/scripts/usage.c
@@ -1,3 +1,4 @@
+/* vi: set sw=4 ts=4: */
 #include <unistd.h>
 #include "busybox.h"