First, change the driver to run the installed yacc instead of the one from
/usr/obj (which might not be there), just as we (intend to) do with all
other tests.
Second, regenerate the expected output files from scratch. Based on visual
inspection, the differences seem OK. But this highlights that the tests in
here are too fragile and, possibly, useless: we should be testing the
behavior of the generated program, not the literal output. Something to be
addressed later.