this was a regression from

    commit ce43d0ae
    use consistent #define checks for the Windows platform

where I converted
    #ifdef WIN
to
    #ifdef _WIN32

But that was already dead code at that point since we did not define
that preprocessor constant anywhere.

Change-Id: Ieadafd61fada05fc19d04d83992fba7c42969daa
Reviewed-on: https://gerrit.libreoffice.org/59402Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>