m_nRT2 and m_nWinBits fields are not in use anymore, at least as far
back as 2013, when the heading files were moved around

Change-Id: Ie3299a5999976450803332aeab72d5c0e68227e2
Reviewed-on: https://gerrit.libreoffice.org/23960Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>