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This back-patches commit e71658523 into out-of-support branches, pursuant to newly-established project policy. The point is to suppress scary-looking warnings so that people building these branches needn't expend brain cells verifying that it's safe to ignore the warnings. Also back-patch the adjacent test from commit 73b416b2e (Suppress clang's unhelpful gripes about -pthread switch being unused) and the necessary autoconf macro from fdea2530b. Discussion: https://postgr.es/m/d0316012-ece7-7b7e-2d36-9c38cb77cb3b@enterprisedb.com