Removed unnecessary chmod commands

Change-Id: Ia6e3f8c567159fc2cf19a8d427a29c5c6dcdf038
Reviewed-on: https://code.wireshark.org/review/3942
Reviewed-by: Graham Bloice <graham.bloice@trihedral.com>
Petri-Dish: Graham Bloice <graham.bloice@trihedral.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>