BUILD: ssl: fix latest LibreSSL reg-test error

starting with OpenSSL 1.0.0 recommended way to disable compression is
using SSL_OP_NO_COMPRESSION when creating context.

manipulations with SSL_COMP_get_compression_methods, sk_SSL_COMP_num
are only required for OpenSSL < 1.0.0
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 4a0ad76..6f62375 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -9701,8 +9701,10 @@
 __attribute__((constructor))
 static void __ssl_sock_init(void)
 {
+#if (!defined(OPENSSL_NO_COMP) && !defined(SSL_OP_NO_COMPRESSION))
 	STACK_OF(SSL_COMP)* cm;
 	int n;
+#endif
 
 	if (global_ssl.listen_default_ciphers)
 		global_ssl.listen_default_ciphers = strdup(global_ssl.listen_default_ciphers);
@@ -9719,11 +9721,13 @@
 #if HA_OPENSSL_VERSION_NUMBER < 0x10100000L
 	SSL_library_init();
 #endif
+#if (!defined(OPENSSL_NO_COMP) && !defined(SSL_OP_NO_COMPRESSION))
 	cm = SSL_COMP_get_compression_methods();
 	n = sk_SSL_COMP_num(cm);
 	while (n--) {
 		(void) sk_SSL_COMP_pop(cm);
 	}
+#endif
 
 #if defined(USE_THREAD) && (HA_OPENSSL_VERSION_NUMBER < 0x10100000L)
 	ssl_locking_init();