patch 8.0.1415: warning for unused function without timers feature

Problem:    Warning for unused function without timers feature.
Solution:   Add #ifdef. (John Marriott)
diff --git a/src/version.c b/src/version.c
index cba8fcf..7b2f89a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1415,
+/**/
     1414,
 /**/
     1413,