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

diff --git a/editors/patch.c b/editors/patch.c
index 11b2f25..f65bbf4 100644
--- a/editors/patch.c
+++ b/editors/patch.c
@@ -20,10 +20,8 @@
  */
 
 #include <getopt.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include "busybox.h"
+
+#include "libbb.h"
 
 static unsigned int copy_lines(FILE *src_stream, FILE *dest_stream, const unsigned int lines_count)
 {