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.

MFC After: 1 day
Sponsored by: Netflix

(cherry picked from commit eb690a0576e8cf5412124477eace3bb765068c3d)