test: skip cluster-disconnect-race on Windows

PR-URL: #5621
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Alexis Campailla <orangemocha@nodejs.org>

Author: gibfahn

test/simple/test-cluster-disconnect-race.js

@@ -9,6 +9,11 @@ var net = require('net');
 var cluster = require('cluster');
 cluster.schedulingPolicy = cluster.SCHED_NONE;
 
+if (process.platform === 'win32') {
+  console.log('1..0 # Skipped: This test does not apply to Windows.');
+  return;
+}
+
 if (cluster.isMaster) {
   var worker1, worker2;