Making .gitignore work on Windows.

BUG=446800

Review URL: https://codereview.chromium.org/957333002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/webrtc/webrtc.DEPS@294244 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed