Remove UTF-8 comment.

This breaks windows build with localized versions of MSVC.

Change-Id: I23c46830f96ae661eced88352476e7ae61fbcc2a
Reviewed-on: https://gerrit.libreoffice.org/6847
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>