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

Ryan Tandy authored Dec 19, 2019 and Quanah Gibson-Mount committed Jan 09, 2020

This reverts commits a956f759 ("Add (not
yet used) ICU detection") and 1cf5838e
("detect ICU and link it into slapd(8)").

Ondřej Kuzník authored Dec 02, 2019 and Quanah Gibson-Mount committed Jan 09, 2020

Long term, overlay callbacks should not be running in tool mode at all.

Howard Chu authored Oct 14, 2019 and Quanah Gibson-Mount committed Nov 22, 2019

If a txn is aborted in id2entry_put, attribute index mappings
added during that txn must also be dropped from memory.

Howard Chu authored Oct 28, 2019 and Quanah Gibson-Mount committed Nov 22, 2019

And additional debug code for tracking errant close()s