librem5 cannot produce Debian package as libjabber.so.0 cannot be found

Package build fails, see https://source.puri.sm/Librem5/carbons/-/jobs/122965 with: dpkg-shlibdeps: error: cannot find library libjabber.so.0 needed by debian/purple-carbons/usr/lib/purple-2/carbons.so

This is due to libjabber.so.0 being a libpurple plugin not being in a standard library directory.