patch 8.2.0059: compiler warnings for unused variables in small build

Problem:    Compiler warnings for unused variables in small build. (Tony
            Mechelynck)
Solution:   Add #ifdef.
diff --git a/src/version.c b/src/version.c
index 5c27a50..aeb1920 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    59,
+/**/
     58,
 /**/
     57,