BUG/MEDIUM: ssl: Don't attempt to use early data with libressl.
Libressl doesn't yet provide early data, so don't put the CO_FL_EARLY_SSL_HS
on the connection if we're building with libressl, or the handshake will
never be done.
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index e11ddb5..cf1b860 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -5336,7 +5336,8 @@
/* leave init state and start handshake */
conn->flags |= CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN;
-#if OPENSSL_VERSION_NUMBER >= 0x10101000L || defined(OPENSSL_IS_BORINGSSL)
+#if (OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)) || \
+ defined(OPENSSL_IS_BORINGSSL)
conn->flags |= CO_FL_EARLY_SSL_HS;
#endif