When on Windows the MSO wasn't installed DOCX and XLSX
embedded documents weren't accessible. General OLE error
was shown after doubleclick on the object.

Linux solution is reused, OLE storage is extracted to
get the document inside.

Change-Id: If4d00fddad8e127fcf1a222836896d2907549d0c
Reviewed-on: https://gerrit.libreoffice.org/39814Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>