Trying to reproduce rhbz#98977, temporarily changing TRANSFORMATION_TIMEOUT_SEC
(filter/source/xsltfilter/XSLTFilter.cxx) to zero, loading a dummy "Microsoft
Excel 2003 XML (.xml)" file shows a "General input/output error" msg box and
"Cancel" leads to a crash due to duplicate calls to m_tcontrol->terminate() from
both XSLTFilter::importer and XSLTFilter::endDocument (both
filter/source/xsltfilter/XSLTFilter.cxx).
Change-Id: Ia103d944f3e1f14ca2cf5552ca3a48348132d38e
36efa8c6a8