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.
diff --git a/src/version.c b/src/version.c
index 1a8c10e..2cc9977 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1645,
+/**/
     1644,
 /**/
     1643,