See [my comment] on the Nix PR to restore the previous behaviour
for why I believe we should remove this for the next release. The PR
should still be backported to stable releases to avoid making breaking
changes to their semantics.
[my comment]: <https://github.com/NixOS/nix/pull/13741#issuecomment-3180851635>
Fixing this across supported Lix versions is required for Nixpkgs to
update toml11, which is a blocker for the CMake 4 update.
Change-Id: I6a6a69642e6b6cb13a9fccc0778e9158b53102d5