Add some missing setlocals from various .bat files

Shell PATH was growing quite long in some cases.

R=gab@chromium.org, iannucci@chromium.org, johnw@chromium.org, maruel@chromium.org

Review URL: https://codereview.chromium.org/180303003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@253347 0039d316-1c4b-4281-b951-d872f2087c98

apply_issue.bat

@@ -2,6 +2,7 @@
 :: Copyright (c) 2012 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
+setlocal
 
 :: This is required with cygwin only.
 PATH=%~dp0;%PATH%

clang-format.bat

@@ -2,6 +2,7 @@
 :: Copyright 2014 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
+setlocal
 
 :: This is required with cygwin only.
 PATH=%~dp0;%PATH%

fetch.bat

@@ -2,6 +2,7 @@
 :: Copyright (c) 2013 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
+setlocal
 
 :: This is required with cygwin only.
 PATH=%~dp0;%PATH%

gclient.bat

@@ -2,6 +2,7 @@
 :: Copyright (c) 2012 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
+setlocal
 
 :: This is required with cygwin only.
 PATH=%~dp0;%PATH%

gn.bat

@@ -2,6 +2,7 @@
 :: Copyright 2013 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
+setlocal
 
 :: This is required with cygwin only.
 PATH=%~dp0;%PATH%