[configs/releng] Remove unused 'arch' user

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>

configs/releng/airootfs/etc/pam.d/su

-#%PAM-1.0
-auth		sufficient	pam_rootok.so
-auth		sufficient	pam_wheel.so trust use_uid
-auth		required	pam_unix.so
-account		required	pam_unix.so
-session		required	pam_unix.so

configs/releng/airootfs/etc/sudoers.d/g_wheel

-%wheel  ALL=(ALL) NOPASSWD: ALL

configs/releng/airootfs/root/customize_airootfs.sh

@@ -11,11 +11,6 @@ usermod -s /usr/bin/zsh root
 cp -aT /etc/skel/ /root/
 chmod 700 /root
 
-useradd -m -p "" -g users -G "adm,audio,floppy,log,network,rfkill,scanner,storage,optical,power,wheel" -s /usr/bin/zsh arch
-
-chmod 750 /etc/sudoers.d
-chmod 440 /etc/sudoers.d/g_wheel
-
 sed -i "s/#Server/Server/g" /etc/pacman.d/mirrorlist
 sed -i 's/#\(Storage=\)auto/\1volatile/' /etc/systemd/journald.conf