updated for version 7.3.1253

Problem:    Still undo problem after using CTRL-R = setline(). (Hirohito
            Higashi)
Solution:   Set the ins_need_undo flag.

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1253,
 /**/
     1252,
 /**/