patch 9.0.1564: display moves up and down with 'incsearch' and 'smoothscroll'

Problem:    Display moves up and down with 'incsearch' and 'smoothscroll'.
Solution:   Do not check if w_skipcol changed. (Luuk van Baal, closes #12410,
            closes #12409)
diff --git a/src/version.c b/src/version.c
index 0e1e326..6cf7de9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1564,
+/**/
     1563,
 /**/
     1562,