S2S-TLS: Verify the TLS certificates by default

This is already mentioned as the default in the manual page and the
sample configuration file, but was actually not enabled in the code!

src/ngircd/conf.c

@@ -2338,6 +2338,11 @@ Init_Server_Struct( CONF_SERVER *Server )
 	Proc_InitStruct(&Server->res_stat);
 	Server->conn_id = NONE;
 	memset(&Server->bind_addr, 0, sizeof(Server->bind_addr));
+
+#ifdef SSL_SUPPORT
+	/* Verify SSL connections by default! */
+	Server->SSLVerify = true;
+#endif
 }
 
 /* -eof- */