Merge #173996: nixosTests.custom-ca: fix meta evaluation

+2
+2
nixos/tests/custom-ca.nix
··· 11 with import ../lib/testing-python.nix { inherit system pkgs; }; 12 13 let 14 makeCert = { caName, domain }: pkgs.runCommand "example-cert" 15 { buildInputs = [ pkgs.gnutls ]; } 16 ''
··· 11 with import ../lib/testing-python.nix { inherit system pkgs; }; 12 13 let 14 + inherit (pkgs) lib; 15 + 16 makeCert = { caName, domain }: pkgs.runCommand "example-cert" 17 { buildInputs = [ pkgs.gnutls ]; } 18 ''