eldbus: make sure eldbus model is hidden behind the BETA API flag

Make sure we keep this in beta for now until our EO based interfaces are ready.

src/lib/eldbus/Eldbus_Model.h

@@ -9,6 +9,8 @@
 extern "C" {
 #endif
 
+#ifdef EFL_BETA_API_SUPPORT
+
 #include <eldbus_model_connection.eo.h>
 #include <eldbus_model_object.eo.h>
 #include <eldbus_model_proxy.eo.h>
@@ -16,6 +18,8 @@ extern "C" {
 #include <eldbus_model_method.eo.h>
 #include <eldbus_model_signal.eo.h>
 
+#endif
+
 #ifdef __cplusplus
 }
 #endif