SSL: use X509_check_host() with LibreSSL. Explicit checks for OPENSSL_VERSION_NUMBER replaced with checks for X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT, thus allowing X509_check_host() to be used with other libraries. In particular, X509_check_host() was introduced in LibreSSL 2.5.0.

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


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  1
#endif

END