patch 8.0.1645: test for terminal response to escape sequence may fail

Problem:    Test for terminal response to escape sequence fails for some
            people. (toothpik)
Solution:   Run "cat" and let it echo the characters.

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1645,
 /**/
     1644,
 /**/