updated for version 7.4.028

Problem:    Equivalence classes are not working for multi-byte characters.
Solution:   Copy the rules from the old to the new regexp engine. Add a test
            to check both engines.

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    28,
 /**/
     27,
 /**/