archlinux: remove deprecated setup of pam since v4.0.3

PAM is now used directly instead of calling su

archlinux/PKGBUILD.install

@@ -330,27 +330,6 @@ update_finalize() {
 
     /usr/lib/qubes/update-proxy-configs
 
-    # Archlinux specific: Update pam.d configuration for su to enable systemd-login wrapper
-    # Also remove pam_unix.so from su configuration
-    # as system-login (which include system-auth) already gives pam_unix.so
-    # with more appropriate parameters (fix the missing nullok parameter)
-
-    if grep -q pam_unix.so /etc/pam.d/su; then
-        echo "Fixing pam.d"
-        cat <<EOF > /etc/pam.d/su
-#%PAM-1.0
-auth		sufficient	pam_rootok.so
-# Uncomment the following line to implicitly trust users in the "wheel" group.
-#auth		sufficient	pam_wheel.so trust use_uid
-# Uncomment the following line to require a user to be in the "wheel" group.
-#auth		required	pam_wheel.so use_uid
-auth		include		system-login
-account		include         system-login
-session		include		system-login
-EOF
-        cp /etc/pam.d/su /etc/pam.d/su-l
-    fi
-
     # Archlinux specific: ensure tty1 is enabled
     rm -f /etc/systemd/system/getty.target.wants/getty@tty*.service
     systemctl enable getty\@tty1.service