awk: Merge in bsd-feature branch of OTA from 20240422 (31bb33a32f71)

In the last 2nd edition import, I mistakenly grabbed from the 'main'
branch of upstream rather than the bsd-feature branch. This means that
we have a regression in awk from that point forward: all the
BSD-specific bit functions (and a few others) were dropped. This
restores it at the same level.

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