updated for version 7.4.477

Problem:    When using ":%diffput" and the other file is empty an extra empty
            line remains.
Solution:   Set the buf_empty flag.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    477,
 /**/
     476,
 /**/