patch 7.4.1610

Problem:    Compiler warnings for non-virtual destructor.
Solution:   Mark the classe final. (Ken Takata)

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1610,
 /**/
     1609,
 /**/