test: define NAPI_EXPERIMENTAL for js-native-api test

Author: siaeyy

test/js-native-api/test_general/binding.gyp

@@ -4,7 +4,10 @@
       "target_name": "test_general",
       "sources": [
         "test_general.c"
-      ]
+      ],
+      "defines": [
+        "NAPI_EXPERIMENTAL"
+      ],
     }
   ]
 }