setup.py: make executable It's common form to be able to execute setup.py directly. BUG=None TEST=`./setup.py ...` works Change-Id: I3155eca1016cc87d2c64562c15aff19cbb058860 Reviewed-on: https://chromium-review.googlesource.com/716341 Commit-Ready: Mike Frysinger <[email protected]> Tested-by: Mike Frysinger <[email protected]> Reviewed-by: Brian Norris <[email protected]>