Roll cygwin for python 2.6/2.7.5 fixes.

BUG=304949
R=maruel@chromium.org

Review URL: https://codereview.chromium.org/26751004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229423 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229423