structured-attrs: chown .attrs.* files to builder
structured-attrs: chown .attrs.* files to builder

Otherwise `chmod .`'ing the build directory doesn't work anymore, which
is done in nixpkgs if sourceRoot is set to '.'.

(cherry picked from commit f8dbde0813c4e8beed6dfd09b093589e027a6675)

dtzWill/nix,dtzWill/nix,dtzWill/nix,dtzWill/nix,dtzWill/nix