QUIC: updated anti-amplification check for draft 32. This accounts for the following change: * Require expansion of datagrams to ensure that a path supports at least 1200 bytes: - During the handshake ack-eliciting Initial packets from the server need to be expanded

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  1
#endif

END