Do not expose define references in require polyfill

Summary:
See facebook#406

Made sure the jest tests pass but didn't know a good unit test to add for this.
Closes facebook#427
Github Author: Jacob Gable <jacob.gable@gmail.com>

Test Plan:
* ./runJestTests
* start app and click around

packager/react-packager/src/DependencyResolver/haste/polyfills/require.js

@@ -586,15 +586,11 @@
   _register('module', 0);
   _register('exports', 0);
 
-  _register('define', define);
   _register('global', global);
   _register('require', require);
   _register('requireDynamic', require);
   _register('requireLazy', requireLazy);
 
-  define.amd = {};
-
-  global.define = define;
   global.require = require;
   global.requireDynamic = require;
   global.requireLazy = requireLazy;