[arch-releng] remove custom script

Might be worth adding locales to profile aka _locale="US" Then mkarchiso could simply set up locales via arch-chroot Uncommenting servers is not always a good thing, either you do not get the fastest or most up to date server. Also I find it very lazy and a user should get used to editing files from day one if they are using Arch. Then we could say goodbye too customize script....