Update config.guess and config.sub from official upstream project at https://savannah.gnu.org/projects/config/
Specifically in this case, commit 5256817ace8493502ec88501a19e4051c2e220b0 for the date Wed Jan 1 19:36:58 2020 +1100
This reverts commits a956f759 ("Add (not
yet used) ICU detection") and 1cf5838e
("detect ICU and link it into slapd(8)").
Long term, overlay callbacks should not be running in tool mode at all.