update ArrayFire upstream to latest commit of devel

9prady9 · 9prady9 · commit e63eb0c1943d · 2016-09-12T14:06:15.000+05:30
diff --git a/arrayfire b/arrayfire
@@ -1 +1 @@
-Subproject commit 71da292bc42e29639443b6873a5de364fa7a45b9
+Subproject commit 2f474a804a381915770981f518493204bb53d3c1
