bzip2: enable parallel building

pkgs/tools/compression/bzip2/default.nix

@@ -24,17 +24,17 @@ stdenv.mkDerivation rec {
     ./CVE-2016-3189.patch
   ];
 
-
   postPatch = ''
     sed -i -e '/<sys\\stat\.h>/s|\\|/|' bzip2.c
   '';
 
-
   outputs = [ "bin" "dev" "out" "man" ];
 
   configureFlags =
     stdenv.lib.optionals linkStatic [ "--enable-static" "--disable-shared" ];
 
+  enableParallelBuilding = true;
+
   meta = with stdenv.lib; {
     description = "High-quality data compression program";
     license = licenses.bsdOriginal;