Fix Invalid Argument return code from IP_Factory in connect_to_server().

Fixes #7732
Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8158)

util/perl/TLSProxy/Proxy.pm

@@ -44,7 +44,7 @@ BEGIN
         $s->close();
     };
     if ($@ eq "") {
-        $IP_factory = sub { IO::Socket::INET6->new(@_); };
+        $IP_factory = sub { IO::Socket::INET6->new(Domain => AF_INET6, @_); };
         $have_IPv6 = 1;
     } else {
         eval {