patch 8.2.0535: regexp patterns not fully tested

Problem:    Regexp patterns not fully tested.
Solution:   Add more regexp tests and others. (Yegappan Lakshmanan,
            closes #5901)

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    535,
 /**/
     534,
 /**/