updated for version 7.4.490

Problem:    Cannot specify the buffer to use for "do" and "dp", making them
            useless for three-way diff.
Solution:   Use the count as the buffer number. (James McCoy)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    490,
 /**/
     489,
 /**/