SSL: fixed SSL_clear_options() usage with OpenSSL 1.1.0+. In OpenSSL 1.1.0 the SSL_CTRL_CLEAR_OPTIONS macro was removed, so conditional compilation test on it results in SSL_clear_options() and SSL_CTX_clear_options() not being used. Notably, this caused "ssl_prefer_server_ciphers off" to not work in SNI-based virtual servers if server preference was switched on in the default server. It looks like the only possible fix is to test OPENSSL_VERSION_NUMBER explicitly.

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


    cat << END                                            >> $NGX_MAKEFILE

$NGX_LIBATOMIC/src/libatomic_ops.a:	$NGX_LIBATOMIC/Makefile
	cd $NGX_LIBATOMIC && \$(MAKE)

$NGX_LIBATOMIC/Makefile:	$NGX_MAKEFILE
	cd $NGX_LIBATOMIC \\
	&& if [ -f Makefile ]; then \$(MAKE) distclean; fi \\
	&& ./configure

END