Revert "awk: Merge upstream 2nd Edition Awk Book"

The pre-push testing I did turned out to be testing the old version with
the old testsuite (for reasons I don't understnad). There's issues with
the new version, the new test in the suite or (likely) both. Revert
until they can be chased down.

This should also fix the github CI that's gone red since this commit.

This reverts commit 3fd60a6b73ac01a72df89751f173970fae4cae73, reversing
changes made to 194df014feebd8b169b41ecd75ae73d63a792d6b.

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