patch 9.0.0641: missing part of the new option code

Problem:    Missing part of the new option code.
Solution:   Add missing WV_SMS.
diff --git a/src/version.c b/src/version.c
index 758ba49..09f4757 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    641,
+/**/
     640,
 /**/
     639,