sort, dependency: ctrlc depends on nix instead of rustix

[oech3]

Blocks #9549 @ChrisDryden

[xtqqczze]

• Switch to rustix? Detegr/rust-ctrlc#112

[oech3]

It seems ctrlc is used only formremoving tmpfiles of sort. It might easy to remove the dep.

[xtqqczze]

ctrlc uses sigaction as well: Detegr/rust-ctrlc#112 (comment)