If we have any "unknown" command line arguments Desktop init will fail,
however our LOK Tiled Rendering test uses Desktop (via soffice_main).
(Other unit tests don't use soffice_main hence this check never
comes into play.) It looks like it's most reliable simply to ignore
--protector here, rather than try to filter it out elsewhere (which
is difficult as it is passed to osl via SAL_IMPLEMENT_MAIN).

Change-Id: I95d047892851ba2cf9edd2e26bacc6efa0320f71