The old SimpleWinLayout::GetNextGlyphs() did it.
PDFWriterImpl::drawVerticalGlyphs() expects GF_ROTL etc to be set when
necessary for vertical text when exporting to PDF.

Change-Id: I1971dd2784efa3cd7274a32a51f61fdf197ec81a
Reviewed-on: https://gerrit.libreoffice.org/20329Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit f295adc5)