[aur-general] Remove `ulex`

[Xyne]

Sergei Lebedev wrote:

> Hello,
> 
> Can you please remove `ulex` [1] package, since it was renamed to
> `ocaml-ulex` [2], which follows OCaml Packaging Guidelines [3]?
> 
> Thanks,
> Sergei
> 
> [1] https://aur.archlinux.org/packages.php?ID=42617
> [2] https://aur.archlinux.org/packages.php?ID=55537
> [3] https://wiki.archlinux.org/index.php/OCaml_Package_Guidelines


done, thanks