Fix ipv6 in Windows 10 #153
Description
Latest Libstrophe branch fails to connect over ipv6 to a server on Windows 10.
The fix is to replace in sock.c, int sock_connect_error(const sock_t sock) function
struct sockaddr sa; with a struct socketaddr_storage sa.
The issue is that struct sockaddr is not guaranteed to be large enough to hold ipv6 adresses, and indeed it isn't on Windows, so getpeername(...) fails.