patch 8.1.0454: resolve() was not tested with a symlink cycle

Problem:    resolve() was not tested with a symlink cycle.
Solution:   Add a test. (Dominique Pelle, closes #3513)
diff --git a/src/version.c b/src/version.c
index dee74d3..caf7168 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    454,
+/**/
     453,
 /**/
     452,