Revert "Fix deprecated Bison syntax."
Revert "Fix deprecated Bison syntax."

This reverts commit 9f6e22bce2a599759cf2a120cfe8da0a435406e5.

Peter Eisentraut requested in #16 to stay sync with PostgreSQL
in respect to Bison compatibility.

markokr/plproxy-dev,markokr/plproxy-dev