trio is only used when the system libraries are insufficient, which should not be the case with GNU libc.
If a recent Debian build of bogofilter were to include libtrio in the build, please report that upstream via Gitlab (preferred) or mailing list with full logs so we can fix that. trio is also going away in future releases. So I'd say NEEDINFO WONTFIX - please tag this bug accordingly, and possibly demote severity.
