This registers SharePoint integration libraries using regsvr.exe.
Both 32-bit and 64-bit libraries are registered; registration of
SharePoint.OpenDocuments is unconditional (subject to ActiveX
feature install state), substituting respective MSO component.

This only works for 32-bit MSI, because in case of 64-bit MSI, only
64-bit SharePoint DLL is included; this makes the library ~useless
in case of 64-bit MSI, because IE needs 32-bit component absent there.
Proper solution will be created for master branch.

Change-Id: Ic5bf9e7090acfaa17d47cb72b9ebfd483242f656
Reviewed-on: https://gerrit.libreoffice.org/72801Reviewed-by: Aron Budea <aron.budea@collabora.com>
Tested-by: Aron Budea <aron.budea@collabora.com>