Archlinux: /bin, /sbin and /usr/sbin are /usr/bin, and /lib is /usr/lib

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
mozilla: add mozilla_manage_user_home_files interface

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>