Build reports

[Ilya N. Golubev]

Keeping several build configurations of local 21.4, 21.5 on at least 4
systems, with at least 2 of them having more than one build
configuration for each source branch.  Using mostly 21.4 on 3 of them.
Rebuilding them with stabilized commands is normally trivial.  Posting
descriptions is not.  Do so for them all?  Perhaps, in my copious free
time.