patch 8.0.0624: warning for unused variable in tiny build

Problem:    Warning for unused variable in tiny build. (Tony Mechelynck)
Solution:   Add an #ifdef.
diff --git a/src/version.c b/src/version.c
index e07d2a8..c066c81 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    624,
+/**/
     623,
 /**/
     622,