detect if Standard is only library to *save*

as opposed to only library at all

Change-Id: I23bebfe7d156e1f4a60bc5f265a3cf9d295f3e4a
Reviewed-on: https://gerrit.libreoffice.org/11275
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Tested-by: Norbert Thiebaud <nthiebaud@gmail.com>