patch 9.0.1610: display is wrong when 'smoothscroll' is set

Problem:    Display is wrong when 'smoothscroll' is set and scrolling multiple
            lines.
Solution:   Redraw with UPD_NOT_VALID when "skipcol" is or was set.
            (closes #12490, closes #12468)
diff --git a/src/version.c b/src/version.c
index 1288490..a8f2104 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1610,
+/**/
     1609,
 /**/
     1608,