Adapt sccp_socket_getOurAddressfor to using the union correctly (Reported by David Cecchin)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5239 43c1dc8c-776e-4df2-8ef1-6e829299be21
Extend the sockaddr_union to include the generic struct sockaddr sa as well

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5240 43c1dc8c-776e-4df2-8ef1-6e829299be21