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

third_party/psutil/psutil/arch/bsd/process_info.h

Index: third_party/psutil/psutil/arch/bsd/process_info.h
diff --git a/third_party/psutil/psutil/arch/bsd/process_info.h b/third_party/psutil/psutil/arch/bsd/process_info.h
index d72e69c1de8810ddfbf83d2c95b806b74f24df11..91291533dc9df82ba2c1cd91aef9159a838f34ff 100644
--- a/third_party/psutil/psutil/arch/bsd/process_info.h
+++ b/third_party/psutil/psutil/arch/bsd/process_info.h
@@ -1,5 +1,9 @@
 /*
- * $Id: process_info.h 213 2009-03-05 15:48:22Z jloden $
+ * $Id: process_info.h 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.
@@ -13,4 +17,5 @@ int get_proc_list(struct kinfo_proc **procList, size_t *procCount);
 char *getcmdargs(long pid, size_t *argsize);
 char *getcmdpath(long pid, size_t *pathsize);
 PyObject* get_arg_list(long pid);
+int pid_exists(long pid);