updated for version 7.4.457

Problem:    Using getchar() in an expression mapping may result in
            K_CURSORHOLD, which can't be recognized.
Solution:   Add the <CursorHold> key.  (Hirohito Higashi)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    457,
 /**/
     456,
 /**/