Use unions to fix a sockaddr_storage aliasing problem that shows up with

g++ 4.3.0.


[SVN r43570]

libs/asio

@@ -1 +1 @@
-Subproject commit 301f79a384a520986e14a7c05ea8cd3c6a620e1d
+Subproject commit 7c43ea93996e80cbfed1f53eb2683c5467a82d85