Fix build with LibreSSL.

Signed-off-by: Piotr Kubaj <pkubaj@anongoth.pl>

diff --git a/dtls.c b/dtls.c
index e191612..c6ea52d 100644
--- a/dtls.c
+++ b/dtls.c
@@ -108,7 +108,7 @@ int RAND_bytes(char *buf, int len)
 extern void dtls1_stop_timer(SSL *);
 #endif
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
 /* Since OpenSSL 1.1, the SSL_SESSION structure is opaque and we can't
  * just fill it in directly. So we have to generate the OpenSSL ASN.1
  * representation of the SSL_SESSION, and use d2i_SSL_SESSION() to
@@ -247,7 +247,7 @@ static int start_dtls_handshake(struct openconnect_info *vpninfo, int dtls_fd)
 #endif
 
 	if (!vpninfo->dtls_ctx) {
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #ifdef HAVE_DTLS12
 		if (dtlsver == DTLS1_2_VERSION)
 			dtls_method = DTLSv1_2_client_method();
@@ -265,7 +265,7 @@ static int start_dtls_handshake(struct openconnect_info *vpninfo, int dtls_fd)
 			vpninfo->dtls_attempt_period = 0;
 			return -EINVAL;
 		}
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 		if (dtlsver == DTLS1_BAD_VER)
 			SSL_CTX_set_options(vpninfo->dtls_ctx, SSL_OP_CISCO_ANYCONNECT);
 #else
diff --git a/openssl-esp.c b/openssl-esp.c
index ed9e8fe..e20bde0 100644
--- a/openssl-esp.c
+++ b/openssl-esp.c
@@ -27,7 +27,7 @@
 #include <openssl/evp.h>
 #include <openssl/rand.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 
 #define EVP_CIPHER_CTX_free(c) do {				\
 				    EVP_CIPHER_CTX_cleanup(c);	\
@@ -69,7 +69,7 @@ static int init_esp_ciphers(struct openconnect_info *vpninfo, struct esp *esp,
 
 	destroy_esp_ciphers(esp);
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 	esp->cipher = malloc(sizeof(*esp->cipher));
 	if (!esp->cipher)
 		return -ENOMEM;
diff --git a/openssl.c b/openssl.c
index 2166d47..f287022 100644
--- a/openssl.c
+++ b/openssl.c
@@ -36,7 +36,7 @@
 #include <openssl/ui.h>
 #include <openssl/rsa.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #define X509_up_ref(x) 	CRYPTO_add(&(x)->references, 1, CRYPTO_LOCK_X509)
 #define X509_get0_notAfter(x) X509_get_notAfter(x)
 #define EVP_MD_CTX_new EVP_MD_CTX_create
@@ -1069,7 +1069,7 @@ static int set_peer_cert_hash(struct openconnect_info *vpninfo)
 	return 0;
 }
 
-#if OPENSSL_VERSION_NUMBER < 0x10002000L
+#if OPENSSL_VERSION_NUMBER < 0x10002000L || defined(LIBRESSL_VERSION_NUMBER)
 static int match_hostname_elem(const char *hostname, int helem_len,
 			       const char *match, int melem_len)
 {
@@ -1605,7 +1605,7 @@ int openconnect_open_https(struct openconnect_info *vpninfo)
 		return ssl_sock;
 
 	if (!vpninfo->https_ctx) {
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 		vpninfo->https_ctx = SSL_CTX_new(TLSv1_client_method());
 #else
 		vpninfo->https_ctx = SSL_CTX_new(TLS_client_method());
@@ -1744,7 +1744,7 @@ int openconnect_open_https(struct openconnect_info *vpninfo)
 	 * 4fcdd66fff5fea0cfa1055c6680a76a4303f28a2
 	 * cd6bd5ffda616822b52104fee0c4c7d623fd4f53
 	 */
-#if OPENSSL_VERSION_NUMBER >= 0x10001070
+#if OPENSSL_VERSION_NUMBER >= 0x10001070 && !defined(LIBRESSL_VERSION_NUMBER)
 	if (string_is_hostname(vpninfo->hostname))
 		SSL_set_tlsext_host_name(https_ssl, vpninfo->hostname);
 #endif
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6677af9..6fa73a4 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -48,17 +48,6 @@ TESTS_ENVIRONMENT = srcdir="$(srcdir)" \
 
 noinst_PROGRAMS = lzstest seqtest
 
-if CHECK_DTLS
-noinst_PROGRAMS += bad_dtls_test
-bad_dtls_test_SOURCES = bad_dtls_test.c
-bad_dtls_test_CFLAGS = $(OPENSSL_CFLAGS)
-bad_dtls_test_LDADD = $(OPENSSL_LIBS)
-
-if DTLS_XFAIL
-XFAIL_TESTS = bad_dtls_test
-endif
-endif
-
 TESTS = $(dist_check_SCRIPTS) $(noinst_PROGRAMS)