Remove exec bits from files that should not be executable

Change-Id: I66f49c6db82eadc3b11cc9b1cf01375e9596a8e6
Reviewed-by: Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Mark Brand <mabrand@mabrand.nl>