patch 8.1.1857: cannot use modifier with multi-byte character

Problem:    Cannot use modifier with multi-byte character.
Solution:   Allow using a multi-byte character, although it doesn't work
            everywhere.

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1857,
 /**/
     1856,
 /**/