core: Further fix fallout from archive mode files
core: Further fix fallout from archive mode files

Continuing from 16c0cfe9b59e2c619d4c57be9c995849af9f659f, we now have
the problem that we're removing the executable bit, which obviously
breaks things when we chroot in for a build.  Fix this by masking over
our bits.

sujitfulse/ostree,resin-io/ostree,resin-io/ostree,gatispaeglis/ostree,resin-io/ostree,resin-io/ostree,leandrosansilva/ostree,resin-io/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,sujitfulse/ostree,sujitfulse/ostree,GNOME/ostree,leandrosansilva/ostree,gatispaeglis/ostree,leandrosansilva/ostree,GNOME/ostree,leandrosansilva/ostree,sujitfulse/ostree,gatispaeglis/ostree,sujitfulse/ostree,leandrosansilva/ostree,gatispaeglis/ostree,gatispaeglis/ostree