patch 8.0.0021

Problem:    In the GUI when redrawing the cursor it may be on the second half
            of a double byte character.
Solution:   Correct the cursor column. (Yasuhiro Matsumoto)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    21,
 /**/
     20,
 /**/