fix(3p/nix/libexpr): Fix attrNames/attrValues builtins for btree_map r/823

Replaces the previous implementations which performed sorting with one
that instead walks through the map (which is already sorted) and
yields values from it.

This fixes a handful of language tests because the previous
implementation did not actually yield useful values on the new implementation.

0 files changed, 0 insertions, 0 deletions