patch 8.0.1452: terminal test fails on some systems

Problem:    Terminal test fails on some systems. (jonathonf)
Solution:   Use "cat" instead of Python to produce the input.  Add a delay.
            (closes #2607)

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1452,
 /**/
     1451,
 /**/