pkg: Use xz directly, not via lzma alias

{ lib, stdenv, fetchFromGitHub, m4, pkg-config, tcl

, bzip2, libarchive, libbsd, lzma, openssl, zlib

, bzip2, libarchive, libbsd, xz, openssl, zlib

}:

stdenv.mkDerivation (finalAttrs: {

  separateDebugInfo = true;

  nativeBuildInputs = [ m4 pkg-config tcl ];

  buildInputs = [ bzip2 libarchive lzma openssl zlib ]

  buildInputs = [ bzip2 libarchive xz openssl zlib ]

    ++ lib.optional stdenv.isLinux libbsd;

  enableParallelBuilding = true;