I received two independent fixes for the Bison released on disk number 4.
One was a disk with the fixes incorporated in the source code, and the
other was a list of diffs (in this directory as BisonDiffs).

Being the relatively lazy sort, I opted to use Johan's version as the
update, but also furnish Doug's diffs in case of problems.  I have not
inspected both solutions to see how they compare...

-Fred
