Fully qualify uses of asio's placeholders to resolve ambiguity with C++0x's

placeholders namespace.


[SVN r45006]

libs/asio

@@ -1 +1 @@
-Subproject commit 7acfc68a3a323f0c45584b0407980b6e49f055f2
+Subproject commit 528e09e9f65d6f174128a842b79a01a1a69ba676