patch 9.0.1612: "skipcol" not reset when using multi-byte characters

Problem:    "skipcol" not reset when using multi-byte characters.
Solution:   Compare with w_virtcol instead of w_cursor.col. (closes #12457)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1612,
 /**/
     1611,
 /**/