Add completion for BSD chflags(1) command

[Low-power]

No description provided.

[Low-power]

Could we use _comp_delimited to support the completion of the comma-separated list?

Yes, that would be more useful.

Which implementations did you reference in preparing the list?

FreeBSD and Darwin.

was_split is only needed when the flag -s is specified to _comp_initialize.

Yep, I forgot to remove this declaration.

[akinomyoga]

Could we use _comp_delimited to support the completion of the comma-separated list?

Yes, that would be more useful.

was_split is only needed when the flag -s is specified to _comp_initialize.

Yep, I forgot to remove this declaration.

Thank you for those updates.

[akinomyoga]

Somehow the CI has failed to start.

https://github.com/scop/bash-completion/actions/runs/7713997204

We recently updated the version of release-please-action in #1075. @Low-power Could you rebase it again on top of the latest master?

[akinomyoga]

I rebased. I also added links to the references in commit 5bd938b.

[scop]

Thanks!