Fix awk.

The previous mix of running yacc during the build but using a checked-in
maketab prebuilt -- though it seems to work -- is actually broken.

For now, just check in a consistent set of generated files.

Test: echo | one-true-awk 'END { if (!failed) { print "OK"; } }'
Change-Id: Ie2bc363333b642e2279e0c1313b8894f369f7450