patch 7.4.1454

Problem:    The exit callback test is flaky.
Solution:   Loop to wait for a short time up to a second.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1454,
 /**/
     1453,
 /**/