update freepto-usb-utils

refs avana-bbs/freepto-usb-utils#16
fix problems with missing fakeroot
Certificates are now bundled in a package
certificates in firefox are now an hook

cert8.db was more similar to a binary than to a config file.
A simple chroot hook will populate it in a more reviewable way.
Also, it will "fetch" from freepto-certificates in a more natural way.
was flash really working without +x ?