Add back module paths from old python_26 configuration.

R=maruel@chromium.org
BUG=304949

Review URL: https://codereview.chromium.org/27603003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/cygwin@229213 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/setup_env.bat b/setup_env.bat
index 361a1ba..b86cf37 100755
--- a/setup_env.bat
+++ b/setup_env.bat
@@ -1,4 +1,7 @@
 :: This script adds cygwin to the path
 @echo OFF
 
-set PATH=%~dp0\bin;%PATH%
+set "PATH=%~dp0\bin;%PATH%"
+:: Make sure systems with non-depot_tools python can still find modules that
+:: were previously included via python_26/Lib/site-packages.
+set "PYTHONPATH=%~dp0\..\..\tools\python;%PYTHONPATH%"