Sync cygwin version with chromium

231940 - Set executable bit on third_party/cygwin/bin/dos2unix.exe
229213 - Add back module paths from old python_26 configuration.
228972 - Remove old python from path.
133786 - Add the svn:executable property to these .bat files

LOG=n
BUG=none
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/111523002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18392 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

DEPS

@@ -14,7 +14,7 @@ deps = {
 deps_os = {
   "win": {
     "v8/third_party/cygwin":
-      "http://src.chromium.org/svn/trunk/deps/third_party/cygwin@66844",
+      "http://src.chromium.org/svn/trunk/deps/third_party/cygwin@231940",
 
     "v8/third_party/python_26":
       "http://src.chromium.org/svn/trunk/tools/third_party/python_26@89111",