SSL: fixed build with LibreSSL 2.8.0 (ticket #1605). LibreSSL 2.8.0 "added const annotations to many existing APIs from OpenSSL, making interoperability easier for downstream applications". This includes the const change in the SSL_CTX_sess_set_get_cb() callback function (see 9dd43f4ef67e), which breaks compilation. To fix this, added a condition on how we redefine OPENSSL_VERSION_NUMBER when working with LibreSSL (see 382fc7069e3a). With LibreSSL 2.8.0, we now set OPENSSL_VERSION_NUMBER to 0x1010000fL (OpenSSL 1.1.0), so the appropriate conditions in the code will use "const" as it happens with OpenSSL 1.1.0 and later versions.

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


ngx_queue_t  ngx_posted_accept_events;
ngx_queue_t  ngx_posted_events;


void
ngx_event_process_posted(ngx_cycle_t *cycle, ngx_queue_t *posted)
{
    ngx_queue_t  *q;
    ngx_event_t  *ev;

    while (!ngx_queue_empty(posted)) {

        q = ngx_queue_head(posted);
        ev = ngx_queue_data(q, ngx_event_t, queue);

        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                      "posted event %p", ev);

        ngx_delete_posted_event(ev);

        ev->handler(ev);
    }
}