drop geteltorito

The AUR package currently has broken checksums. I can't remember the
last time I used this. And it is just a perl script, so there's no value
in having it as a package. Just curl the script if you need it, and add
it to $PATH if you're feeling ambitious.

roles/archive/tasks/main.yml

@@ -44,14 +44,6 @@
   tags:
     - lesspipe
 
-- name: Install geteltorito
-  aur:
-    name: geteltorito
-    user: "{{ user.name }}"
-  tags:
-    - aur
-    - geteltorito
-
 - name: Install pigz
   pacman:
     name: pigz