dc6281cf1d880c48904bf6d445a021a5936001bb Fix: A few let variables h…

…ad slipped in, which doesn't work in old Safari

https://datatables.net/forums/discussion/79829

Sync to source repo @dc6281cf1d880c48904bf6d445a021a5936001bb

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/DataTablesSrc",
     "last-tag": "2.1.6",
-    "last-sync": "a7e148ff64c424bed3d6e86e91494357a9afba7c"
+    "last-sync": "dc6281cf1d880c48904bf6d445a021a5936001bb"
 }