Use a bitmask type for the resolver flags, as per the TR2 proposal. This will

prevent implicit conversion from int to flags, allowing the compiler to catch
cases where users incorrectly pass a numeric port number as the service name.


[SVN r60687]

libs/asio

@@ -1 +1 @@
-Subproject commit 3f3c9aefa1dc34875f93691e956e4dbacd5f3c4f
+Subproject commit 96ad484574e4e9c6618ffd11ad9b43f5ffca3633