add default listen port at the end of server block parsing instead of merge phase: otherwise the first server without an listen directive did not become the default server if there was no explicit default server; the bug has been introduced in r3218

# Copyright (C) Igor Sysoev


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $ngx_param
#define $ngx_param  $ngx_value
#endif

END