fix segfaults if no listen directive was set in default server {} block: ngx_http_add_listen() uses server's connection_pool_size and client_header_timeout values, therefore it must be called after the values have been merged, the bug had been introduced in r3218

# Copyright (C) Igor Sysoev


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  $value
#endif

END