Prefer ReuseAddr over Reuse, with IO::Socket::INET

Reuse is deprecated and ReuseAddr is prefered, according to documentation.
Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

util/TLSProxy/Proxy.pm

@@ -173,7 +173,7 @@ sub clientstart
         LocalPort   => $self->proxy_port,
         Proto       => "tcp",
         Listen      => SOMAXCONN,
-        Reuse       => 1
+        ReuseAddr   => 1
     );
 
     if ($proxy_sock) {