node-api: guard experimental node_api_set_prototype

Author: siaeyy

src/js_native_api.h

@@ -197,9 +197,12 @@ NAPI_EXTERN napi_status NAPI_CDECL napi_coerce_to_string(napi_env env,
                                                          napi_value* result);
 
 // Methods to work with Objects
+#ifdef NAPI_EXPERIMENTAL
+#define NODE_API_EXPERIMENTAL_HAS_SET_PROTOTYPE
 NAPI_EXTERN napi_status NAPI_CDECL node_api_set_prototype(napi_env env,
                                                           napi_value object,
                                                           napi_value value);
+#endif
 NAPI_EXTERN napi_status NAPI_CDECL napi_get_prototype(napi_env env,
                                                       napi_value object,
                                                       napi_value* result);