Check whether exceptions are enabled on the output iostream and throw or not

throw errors accordingly.


[SVN r39504]

libs/asio

@@ -1 +1 @@
-Subproject commit e5c82d221a4c8e42085a990cd0da321bf9c18f08
+Subproject commit 331beee1a610af134bb7dd03ffa40266ad5f79b5