[cloud] Enable IPv6 and HTTPS in cloud boot images

Signed-off-by: Michael Brown <mcb30@ipxe.org>
diff --git a/src/config/cloud/general.h b/src/config/cloud/general.h
index 99028c1..38799fd 100644
--- a/src/config/cloud/general.h
+++ b/src/config/cloud/general.h
@@ -1,3 +1,7 @@
+/* Enable IPv6 and HTTPS */
+#define NET_PROTO_IPV6
+#define DOWNLOAD_PROTO_HTTPS
+
 /* Allow retrieval of metadata (such as an iPXE boot script) from
  * Google Compute Engine metadata server.
  */