Archives are usually not meant to be executable and hence should not
need the executable bit set. Drop it consistently to avoid unintential
(and potentially harmful) execution.
Note, no binary in this repository has been identified as harmful in any
way; this is just a drive-by change.
Suggested-by: Philipp Reichart <reichart@google.com> Signed-off-by: Matthias Maennich <maennich@google.com>