Update binaryen to fix -Werror with GCC 8

cuviper · cuviper · commit 37b5af260050 · 2018-02-07T12:20:25.000-08:00
diff --git a/src/binaryen b/src/binaryen
@@ -1 +1 @@
-Subproject commit 1c9bf65aa0e371b84755a8ddd6e79497fac57171
+Subproject commit 17841e155edf858c8ea7802dd5f5ecbef54b989f
