message: make flatbuffers.js into a UMD module
diff: /// @{
  /// @cond FLATBUFFERS_INTERNAL
  +(function (global, factory) {
  + typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = { flatbuffers: factory() } :
  + typeof define === 'function' && define.amd ? define(factory) :
  + (global.flatbuffers = factory());
  +}(this, (function () { 'use strict';
  /**
  - * @fileoverview
  - *
  - * Need to suppress 'global this' error so the Node.js export line doesn't cause
  - * closure compile to error out.
  - * @suppress {globalThis}
  - */
  -
  -/**
  - * @const
  - * @namespace
  +* @exports flatbuffers
  */
  var flatbuffers = {};
  @@ -1160,8 +1156,9 @@ flatbuffers.ByteBuffer.prototype.createLong = function(low, high) {
  return flatbuffers.Long.create(low, high);
  };
  -// Exports for Node.js and RequireJS
  -this.flatbuffers = flatbuffers;
  +return flatbuffers;
  +
  +})));
  /// @endcond
  /// @}
  