Update third_party/psutil and fix the licence issue with it.

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

 /*
- * $Id: process_info.c 772 2010-11-03 13:51:11Z g.rodola $
+ * $Id: process_info.c 1142 2011-10-05 18:45:49Z 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>
@@ skipping 222 matching lines @@
             PyList_Append(retlist, item);
             Py_DECREF(item);
             pos = pos + strlen(&argstr[pos]) + 1;
         }
     }
 
     free(argstr);
     return retlist;
 }
 
+
+/*
+ * Return 1 if PID exists in the current process list, else 0.
+ */
+int
+pid_exists(long pid)
+{
+    int kill_ret;
+    if (pid < 0) {
+        return 0;
+    }
+
+    // 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;
+}
+