zziplib: convert back to autotools build

The cmake support in the v0.13.x branch is not very good. It heavily
relies on add_custom_command and is fragile.

The specific problem we ran into is that the install phase would not
create some of the symlinks on darwin. This breaks reverse
dependencies (e.g. texlive).

Fixes: 4f701dd3 ('zziplib: 0.13.69 → 0.13.71')