patch 7.4.1097

Problem:    Looking up the alloc ID for tests fails.
Solution:   Fix the line computation.  Use assert_fails() for unlet test.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1097,
 /**/
     1096,
 /**/