contrib/packaging/wix/guids.wxi

setup: fix the py2exe logic to work with py3

TortoiseHg still uses (the modernized) py2exe packaging, but the build was
failing since `py2exe.Distribution` was removed.

One thing to note is that later in this module, there's a hack to include
`distutils` when building from a virtualenv.  While `import distutils` works in
`hg debugshell` when built with py2, it doesn't work in py3.  I'm not sure why-
I don't see it in `library.zip` either.  It doesn't seem to break anything
though.

Differential Revision: https://phab.mercurial-scm.org/D12553

<Include>
  <!-- These are component GUIDs used for Mercurial installers.
       YOU MUST CHANGE ALL GUIDs below when copying this file
       and replace 'Mercurial' in this notice with the name of
       your project. Component GUIDs have global namespace!      -->

  <!-- mercurial.wxs -->
  <?define ProductUpgradeCode = {A1CC6134-E945-4399-BE36-EB0017FDF7CF} ?>
  <?define ComponentMainExecutableGUID = {D102B8FA-059B-4ACC-9FA3-8C78C3B58EEF} ?>
  <?define ProgramMenuDir.guid = {D5A63320-1238-489B-B68B-CF053E9577CA} ?>

</Include>