Replace OPENSSL_VERSION_NUMBER check with defined(TLS1_3_VERSION) check for TLS v1.3 compatibility

This provides compatibility with other SSL libraries like LibreSSL
with different semantics of OPENSSL_VERSION_NUMBER.

1 files changed, 1 insertions, 1 deletions

diff --git a/tls.c b/tls.c
index dcd7435..db3aaa7 100644
--- a/tls.c
+++ b/tls.c
@@ -257,7 +257,7 @@ const char *ssl_proto_text(int version) {
             return "tlsv1.1";
         case TLS1_2_VERSION:
             return "tlsv1.2";
-#if OPENSSL_VERSION_NUMBER >= 0x10101000L
+#if defined(TLS1_3_VERSION)
         case TLS1_3_VERSION:
             return "tlsv1.3";
 #endif