Update update_depot_tools to always check out Windows tools on Cygwin.

This is necessary so that Cygwin users have a python directory in depot_tools/,
which will soon be used by gyp_chromium.

BUG=335180

Review URL: https://codereview.chromium.org/141523009

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@245704 0039d316-1c4b-4281-b951-d872f2087c98

update_depot_tools

@@ -17,6 +17,13 @@ then
     base_dir=`cd "$base_dir" && pwd -P`
 fi
 
+# Don't try to use Cygwin tools.  Get real win32 tools using the batch script.
+OUTPUT="$(uname | grep 'CYGWIN')"
+CYGWIN=$?
+if [ $CYGWIN = 0 ]; then
+  cmd /c `cygpath -w "$base_dir/bootstrap/win/win_tools.bat"` force
+fi
+
 # Test if this script is running under a MSys install.  If it is, we will
 # hardcode the paths to SVN and Git where possible.
 OUTPUT="$(uname | grep 'MINGW')"