Remove psutil from tree, install via install-build-deps.sh

third_party/psutil/psutil/_psutil_posix.h

Index: third_party/psutil/psutil/_psutil_posix.h
diff --git a/third_party/psutil/psutil/_psutil_posix.h b/third_party/psutil/psutil/_psutil_posix.h
deleted file mode 100644
index 8a1f52257c9bdf1a4c8b301284f7afdf31c5cf10..0000000000000000000000000000000000000000
--- a/third_party/psutil/psutil/_psutil_posix.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/*
- * $Id: _psutil_posix.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.
- *
- * POSIX specific module methods for _psutil_posix
- */
-
-#include <Python.h>
-
-static PyObject* posix_getpriority(PyObject* self, PyObject* args);
-static PyObject* posix_setpriority(PyObject* self, PyObject* args);
-