Attempting to fix a C:\cygwin\bin\python.exe stack trace

Review URL: https://chromiumcodereview.appspot.com/10206030

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@135377 0039d316-1c4b-4281-b951-d872f2087c98

gclient.bat

@@ -3,8 +3,11 @@
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
 
+:: This is required with cygwin only.
+PATH=%~dp0;%PATH%
+
 :: Synchronize the root directory before deferring control back to gclient.py.
 call "%~dp0\update_depot_tools.bat"
 
 :: Defer control.
-python "%~dp0\gclient.py" %*
+%~dp0python "%~dp0\gclient.py" %*