patch 8.0.1613: warning for unused variable in tiny build

Problem:    Warning for unused variable in tiny build. (Tony Mechelynck)
Solution:   Move declaration to inner block.
diff --git a/src/version.c b/src/version.c
index a588344..b5c6137 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1613,
+/**/
     1612,
 /**/
     1611,