4bcab74b94
How libinput tries to create /etc changed in upstream commit
05501cd34f9c ("meson: use install_emptydir to create directory"),
so we have to update our sed expression.
This was missed in when libinput was updated in Nixpkgs due to a Nix
bug[1], which made the sandbox's /etc writeable.
[1]: https://github.com/NixOS/nix/issues/7813
Fixes: bf928e5579 ("libinput: 1.21.0 → 1.22.1")