Make build-header.py executable.
Make build-header.py executable.

AmitaiB/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory