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bt shows:
Program received signal SIGSEGV, Segmentation fault.
0x00002aaadba213fb in oox::vml::InputStream::updateBuffer (this=0x8d7fd80) at /home/julien/compile-libreoffice/libreoffice/oox/source/vml/vmlinputstream.cxx:339
339	    while( (mnBufferPos >= maBuffer.getLength()) && !mxTextStrm->isEOF() )
(gdb) bt
0x00002aaadba213fb in oox::vml::InputStream::updateBuffer (this=0x8d7fd80) at /home/julien/compile-libreoffice/libreoffice/oox/source/vml/vmlinputstream.cxx:339
0x00002aaadba21048 in oox::vml::InputStream::available (this=0x8d7fd80) at /home/julien/compile-libreoffice/libreoffice/oox/source/vml/vmlinputstream.cxx:326
0x00002aaacf5a0249 in sax_fastparser::FastSaxParserImpl::parseStream (this=0x89aea30, maStructSource=...)
at /home/julien/compile-libreoffice/libreoffice/sax/source/fastparser/fastparser.cxx:810

Indeed, mxTextStrm is invalid, so let's test its validity in InputStream constructor

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This reverts commit 3b26995b.

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This reverts commit 4968f83c.

seeing as its seems to stop windows building

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