Persistent lei-daemon still leads to ECONNRESET client errors on
FreeBSD, and maxing out the kern.ipc.soacceptqueue sysctl (as
documented in the FreeBSD listen(2) manpage) doesn't seem to
help.
"make check-run" is still 4-5s faster than "make check" on my
FreeBSD VM even after this change, so it's still a worthwhile
improvement.