[COMMITTERS] pgsql: Silence Bison deprecation warnings

Silence Bison deprecation warnings

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

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/3f9479603caca249fb3643871c24c6fa55a339b4

Modified Files
--------------
config/programs.m4 | 8 ++++++++
configure          | 8 ++++++++
2 files changed, 16 insertions(+)