contrib/wix/defines.wxi

journal: use the dirstate parentchange callbacks

Instead of hacking into dirstate internals let's use the callbacks
to be notified about wd parent change.

<Include>

  <?if $(var.Platform) = "x64" ?>
    <?define IsX64 = yes ?>
  <?else?>
    <?define IsX64 = no ?>
  <?endif?>

</Include>