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Bison >=3.0 issues warnings about
%name-prefix="base_yy"
instead of the now preferred
%name-prefix "base_yy"
but the latter doesn't work with Bison 2.3 or less. So for now we
silence the deprecation warnings.
Back-patch to 9.2 and 9.3 -- the newer branches already have this fix.
Author: Peter Eisentraut
Discussion: https://postgr.es/m/677.1483384145%40sss.pgh.pa.us