patch 9.0.0645: CTRL-Y does not stop at line 1

Problem:    CTRL-Y does not stop at line 1. (John Marriott)
Solution:   Stop at line 1 when 'smoothscroll' is not set. (closes #11261)
diff --git a/src/version.c b/src/version.c
index 32a9851..0cf367e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    645,
+/**/
     644,
 /**/
     643,