update ArrayFire upstream to latest commit of devel

9prady9 · 9prady9 · commit ade6e9ad903f · 2016-09-05T15:03:43.000+05:30
diff --git a/arrayfire b/arrayfire
@@ -1 +1 @@
-Subproject commit 71da292bc42e29639443b6873a5de364fa7a45b9
+Subproject commit 818171975bba6e46adb3f682b60aa83573da2622
