make combine_libs.py not bail out when run under the system provided python under Cygwin.
make combine_libs.py not bail out when run under the system provided python under Cygwin.

BUG=35342
TEST=in cygwin do: %> devenv /build Debug chrome.sln

Review URL: http://codereview.chromium.org/593087

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@38950 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser