updated for version 7.4.640
Problem:    After deleting characters in Insert mode such that lines are
            joined undo does not work properly. (issue 324)
Solution:   Use Insstart instead of Insstart_orig. (Christian Brabandt)
diff --git a/src/version.c b/src/version.c
index e920644..3365c80 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    640,
+/**/
     639,
 /**/
     638,