Update arrayfire submodule to latest

9prady9 · 9prady9 · commit bcdc406064bf · 2016-06-14T12:13:46.000+05:30
diff --git a/arrayfire b/arrayfire
@@ -1 +1 @@
-Subproject commit 5842ed25195848653148fa9b3a8270255d83f5b8
+Subproject commit a4fa33844fbd19286f57f12e06268d8ce855bbea
