patch 7.4.1491

Problem:    Visual-block shift breaks multi-byte characters.
Solution:   Compute column differently. (Yasuhiro Matsumoto) Add a test.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1491,
 /**/
     1490,
 /**/