patch 8.1.0157: old iTerm2 is not recognized, resulting in stray output

Problem:    Old iTerm2 is not recognized, resulting in stray output.
Solution:   Recognize the termresponse.

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    157,
 /**/
     156,
 /**/