Don't run presubmit checks on python276_bin.
Don't run presubmit checks on python276_bin.

Actually, don't run presubmit checks on anything starting with
python and ending with _bin.

BUG=326975

Review URL: https://codereview.chromium.org/111643002

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@240316 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools