Functions suffixed with A/W (ANSI/Wide) as needed for clarity

This completes the _tstring/TCHAR/TEXT elimination for setup_native/

Change-Id: I66292fd490a09f75b8691274255ba41870074065
Reviewed-on: https://gerrit.libreoffice.org/25771Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>