luaPackages.luarocks_bootstrap: Fix build

I don't know what conditions are necessary to have the files in
`/etc/luarocks` populated so using `replace-quiet`.

At least on cross there is a file which contains configuration.

pkgs/development/tools/misc/luarocks/default.nix

@@ -66,7 +66,7 @@ stdenv.mkDerivation (finalAttrs: {
   postInstall = ''
     sed -e "1s@.*@#! ${lua}/bin/lua$LUA_SUFFIX@" -i "$out"/bin/*
     substituteInPlace $out/etc/luarocks/* \
-     --replace-fail '${lua.luaOnBuild}' '${lua}'
+     --replace-quiet '${lua.luaOnBuild}' '${lua}'
    ''
     + lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
     installShellCompletion --cmd luarocks \