dnsmasq: enable parallel building (#451242)

pkgs/by-name/dn/dnsmasq/package.nix

@@ -53,6 +53,8 @@ stdenv.mkDerivation rec {
     "PKG_CONFIG=${buildPackages.pkg-config}/bin/${buildPackages.pkg-config.targetPrefix}pkg-config"
   ];
 
+  enableParallelBuilding = true;
+
   postBuild = lib.optionalString stdenv.hostPlatform.isLinux ''
     make -C contrib/lease-tools
   '';