Both the hexdump and the OLE1 reader can be shared.

Change-Id: I97d72a8deeb9c79fc8e8c4a73c613213badfa744
Reviewed-on: https://gerrit.libreoffice.org/51783Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>