update setsockopt error set according to POSIX

In the code review I accidentally encouraged Luna to remove some
handling of errors that are possible according to POSIX, but I think how
Luna had it before was better, so I fixed it, and now the branch should
be good to merge.
99f6f8ead9Andrew Kelley committed on 12/31/2019, 12:35:05 AMparent22f6297
1 file changedLine totals unavailable