Add psutil build step to fix pyauto media issues. Upgrade psutil to 0.4.0.

third_party/psutil/psutil/arch/bsd/process_info.c

 /*
- * $Id: process_info.c 1142 2011-10-05 18:45:49Z g.rodola $
+ * $Id: process_info.c 1187 2011-10-22 15:56:59Z g.rodola $
  *
  * Copyright (c) 2009, Jay Loden, Giampaolo Rodola'. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Helper functions related to fetching process information. Used by _psutil_bsd
  * module methods.
  */
 
 #include <Python.h>
 #include <assert.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
 #include <sys/param.h>
 #include <sys/user.h>
 #include <sys/proc.h>
+#include <signal.h>
 
 #include "process_info.h"
 
 
 /*
  * Returns a list of all BSD processes on the system.  This routine
  * allocates the list and puts it in *procList and a count of the
  * number of entries in *procCount.  You are responsible for freeing
  * this list (use "free" from System framework).
  * On success, the function returns 0.
@@ skipping 228 matching lines @@
     // if kill returns success of permission denied we know it's a valid PID
     kill_ret = kill(pid , 0);
     if ((0 == kill_ret) || (EPERM == errno)) {
         return 1;
     }
 
     // otherwise return 0 for PID not found
     return 0;
 }