patch 9.0.0908: with 'smoothscroll' cursor may end up in wrong position

Problem:    With 'smoothscroll' cursor may end up in wrong position.
Solution:   Correct the computation of screen lines. (Yee Cheng Chin,
            closes #11502)
diff --git a/src/version.c b/src/version.c
index 588c312..f6640c3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    908,
+/**/
     907,
 /**/
     906,