return NAPI_MODULE_INITIALIZER_X for backward compat

Author: vmoroz

src/node_api.h

@@ -160,6 +160,11 @@ typedef struct napi_module {
 #define NAPI_MODULE_X(modname, regfunc, priv, flags)                           \
   NAPI_MODULE_XV(modname, regfunc, NAPI_VERSION, priv, flags)
 
+// Not used. For backward compatibility only.
+#define NAPI_MODULE_INITIALIZER_X(base, version)                               \
+  NAPI_MODULE_INITIALIZER_X_HELPER(base, version)
+#define NAPI_MODULE_INITIALIZER_X_HELPER(base, version) base##version
+
 #define NAPI_CONCAT_HELPER(text1, text2) text1##text2
 #define NAPI_CONCAT(text1, text2) NAPI_CONCAT_HELPER(text1, text2)