patch 9.0.1116: compiler may complain about an unused function

Problem:    Compiler may complain about an unused function.
Solution:   Add #ifdef. (John Marriott)
diff --git a/src/version.c b/src/version.c
index 3166491..429d76c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1116,
+/**/
     1115,
 /**/
     1114,