[arch-releng] custmize_airootfs function

[Mr Green]

Am testing out gitlab mkarchiso and all seems fine except I am getting
/etc/skel files put in /root? Rather than a users home directory? Files in
/etc/skel should be for users rather than root.

Archiso configs could easily ship with required files in /airootfs/root by
default.

If I turn off '#' out or disable function then /etc/skel files are not
present any longer.

They are present in both /root and /home/user folders?