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

third_party/psutil/psutil/_psutil_linux.h

Index: third_party/psutil/psutil/_psutil_linux.h
diff --git a/third_party/psutil/psutil/_psutil_linux.h b/third_party/psutil/psutil/_psutil_linux.h
deleted file mode 100644
index 1dc36c80b08e662b2f62c1763ba7bf04c8cd698c..0000000000000000000000000000000000000000
--- a/third_party/psutil/psutil/_psutil_linux.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * $Id: _psutil_linux.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.
- *
- * LINUX specific module methods for _psutil_linux
- */
-
-#include <Python.h>
-
-static PyObject* linux_ioprio_get(PyObject* self, PyObject* args);
-static PyObject* linux_ioprio_set(PyObject* self, PyObject* args);
-static PyObject* get_disk_partitions(PyObject* self, PyObject* args);
-