patool: Missing shell completion

[PRESFIL]

Describe the bug

Apparently, bash-completion for patool is not available since version 1.15 (2.0.0 for nixpkgs).

Steps To Reproduce

1. nix-shell -p patool
2. patool tab tab

Expected behavior

patool's sub-commands completion should appear. File completion shown instead.

Additional context

Discussions in the original patool repository:

• Update bash_completion docs wummel/patool#41
• [feature request] bash completion wummel/patool#127

Also, completion from bash-completion package was removed:

• Supressing output from completion script scop/bash-completion#506

Here's how bash-completion generates in AUR-package:

• https://aur.archlinux.org/cgit/aur.git/commit/?h=patool&id=9eee632dca6073d4badc7e8a9557c03495fac7e1

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