Despite some experimenting, i'm unable to find any relevant effect of

creating an index for the keys table on apropos(1) search times;
apparently, adding that index was premature optimization in the first
place; so, stop adding that index.

Its root gone, the following evil is reduced (/usr/share/man on my notebook)
 - DB build time with -Q goes down by 15%, now at 1/3 of makewhatis
 - DB size with -Q goes down by 35%, now at 3.5x of makewhatis
 - full DB build time goes down by 12%, now at 2.1x of makewhatis
 - full DB size goes down by 42%, now at 11.5x of makewhatis

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