Follow-up to 34700400; this fixes sw_ww8export
unit test on Windows.

Change-Id: Ic0c3228efb59a182e1562b73117418cd8b5e6017
Reviewed-on: https://gerrit.libreoffice.org/18175Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>