QPID-4905: Add needed virtual destructor missed earlier

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1494700 13f79535-47bb-0310-9956-ffa450edef68
QPID-4931: Remove removed member function from windows SocketAddress
code too. While there bring this code up to date with other recent
changes to the POSIX equivalent code.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1494712 13f79535-47bb-0310-9956-ffa450edef68