patch 8.0.0817: cannot get the terminal line at the cursor

Problem:    Cannot get the line of a terminal window at the cursor.
Solution:   Make the row argunt optionsl. (Yasuhiro Matsumoto, closes #1898)

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    817,
 /**/
     816,
 /**/