Fix compilation without server and sftp modes

(cherry picked from commit 809b3adeba)

src/messages.c

@@ -69,6 +69,26 @@ static ssh_message ssh_message_new(ssh_session session){
   return msg;
 }
 
+#ifndef WITH_SERVER
+
+/* Reduced version of the reply default that only reply with
+ * SSH_MSG_UNIMPLEMENTED
+ */
+static int ssh_message_reply_default(ssh_message msg) {
+  ssh_log(msg->session, SSH_LOG_FUNCTIONS, "Reporting unknown packet");
+
+  if (buffer_add_u8(msg->session->out_buffer, SSH2_MSG_UNIMPLEMENTED) < 0)
+    goto error;
+  if (buffer_add_u32(msg->session->out_buffer,
+      htonl(msg->session->recv_seq-1)) < 0)
+    goto error;
+  return packet_send(msg->session);
+  error:
+  return SSH_ERROR;
+}
+
+#endif
+
 static int ssh_execute_message_callback(ssh_session session, ssh_message msg) {
     int ret;
     if(session->ssh_message_callback != NULL) {

tests/torture.c

@@ -216,6 +216,8 @@ failed:
     return NULL;
 }
 
+#ifdef WITH_SFTP
+
 struct torture_sftp *torture_sftp_session(ssh_session session) {
     struct torture_sftp *t;
     char template[] = "/tmp/ssh_torture_XXXXXX";
@@ -282,7 +284,10 @@ void torture_sftp_close(struct torture_sftp *t) {
     free(t->testdir);
     free(t);
 }
-#endif
+#endif /* WITH_SFTP */
+
+#endif /* _WIN32 */
+
 
 int torture_libssh_verbosity(void){
   return verbosity;