BUILD: fix build issue without USE_OPENSSL

The SSL check referenced use_ssl which only exists when USE_OPENSSL is set.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index c6b0235..86bc15c 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -4570,11 +4570,12 @@
 			 * same as for the production traffic. Otherwise we use raw_sock by
 			 * default, unless one is specified.
 			 */
+#ifdef USE_OPENSSL
 			if (!newsrv->check.port && !is_addr(&newsrv->check.addr)) {
 				newsrv->check.use_ssl |= newsrv->use_ssl;
 				newsrv->check.send_proxy |= (newsrv->state & SRV_SEND_PROXY);
 			}
-
+#endif
 			/* try to get the port from check.addr if check.port not set */
 			if (!newsrv->check.port)
 				newsrv->check.port = get_host_port(&newsrv->check.addr);