patch 7.4.2206
Problem:    Warning for unused function.
Solution:   Put the function inside #ifdef. (John Marriott)
diff --git a/src/version.c b/src/version.c
index dd7b4b7..bb6eaba 100644
--- a/src/version.c
+++ b/src/version.c
@@ -764,6 +764,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2206,
+/**/
     2205,
 /**/
     2204,