Update prebuilt Clang to match Android kernel.

Bug: 132428451
Change-Id: I8f6e2cb23f381fc0c02ddea99b867e58e925e5be
diff --git a/linux-x64/clang/bin/git-clang-format b/linux-x64/clang/bin/git-clang-format
index 0b21039..2696d09 100755
--- a/linux-x64/clang/bin/git-clang-format
+++ b/linux-x64/clang/bin/git-clang-format
@@ -2,10 +2,9 @@
 #
 #===- git-clang-format - ClangFormat Git Integration ---------*- python -*--===#
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===------------------------------------------------------------------------===#
 
@@ -23,7 +22,7 @@
 Requires Python 2.7 or Python 3                                                  
 """               
 
-from __future__ import print_function
+from __future__ import absolute_import, division, print_function
 import argparse
 import collections
 import contextlib