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: https://v8.googlecode.com/svn/branches/bleeding_edge@18392 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert r18390 - "Roll gyp 1685:1806"

Doesn't work with python2.7 - I tested with 2.6 :-/

BUG=none
TBR=hpayer@chromium.org
LOG=n

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18394 ce2b1a6d-e550-0410-aec6-3dcde31c8c00