- Caught the real cause of #183098. It failed because the parser built with
        `flex -f' *sometimes* made it into the final package, and
    -f assumes seven-bit tables. Solution has two steps. Move `make bigcheck'
        to `%%check' part, where it belongs anyway, so that flexes built during
        `make bigcheck' don't overwrite original build. And change makefile so
        that `make bigcheck' will *always* execute *all* check commands.