portability fix for bison-1.75

[Paul Eggert]

Kris Kennaway <kris at obsecurity.org> writes:

> Unfortunately there is a lot of software that cannot be used as-is
> with the newer version.  This seems to be because the newer versions
> of bison are not backwards-compatible, which is irritating to say the
> least.

That's news to me.  Has anyone filed a bug report about these
irritating backward-compatibility issues to <bug-bison at gnu.org>?

Possibly the backward-compatibility problems, whatever they were, have
already been fixed.  In that case I'd still recommend that people not
use 1.75, as it has some real bugs.