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)
diff --git a/src/version.c b/src/version.c
index e01f2be..0549494 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1452,
+/**/
     1451,
 /**/
     1450,