Remove the error::success constant since with the new error_code stuff

there is no unique value for success.


[SVN r36068]

libs/asio

@@ -1 +1 @@
-Subproject commit 0b9d2dc40071a398c2373785abba827ec6edd0f2
+Subproject commit 8b56b8cf6d8b2dbf68dbc701af00d79c4c88dc14