patch 8.2.4725: unused variable in tiny build

Problem:    Unused variable in tiny build.
Solution:   Add #ifdef.
diff --git a/src/version.c b/src/version.c
index ecf8461..740c32d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4725,
+/**/
     4724,
 /**/
     4723,