test: disable dgram-bind-shared-ports on win32

Windows currently doesn't support clustered dgram sockets, when it does
re-enable this test

test/simple/test-dgram-bind-shared-ports.js

@@ -24,6 +24,11 @@ var assert = require('assert');
 var cluster = require('cluster');
 var dgram = require('dgram');
 
+// TODO XXX FIXME when windows supports clustered dgram ports re-enable this
+// test
+if (process.platform == 'win32')
+  process.exit(0);
+
 function noop() {}
 
 if (cluster.isMaster) {