QUIC: moved "handshake failed" reason to send_alert. A QUIC handshake failure breaks down into several cases: - a handshake error which leads to a send_alert call - an error triggered by the add_handshake_data callback - internal errors (allocation etc) Previously, in the first case, only error code was set in the send_alert callback. Now the "handshake failed" reason phrase is set there as well. In the second case, both code and reason are set by add_handshake_data. In the last case, setting reason phrase is removed: returning NGX_ERROR now leads to closing the connection with just INTERNAL_ERROR. Reported by Jiuzhou Cui.

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


cat << END >> $NGX_AUTO_HEADERS_H

#ifndef $have
#define $have  1
#endif

END