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Fix typo in pg_srand48 (srand48 in older branches).
">" should be ">>". This typo results in failure to use all of the bitsof the provided seed.This might rise to the level of a security bug if we were relying onsrand48 for any security-critical purposes, but we are not --- in fact,it's not used at all unless the platform lacks srandom(), which isimprobable. Even on such a platform the exposure seems minimal.Reported privately by Andres Freund.1 parentb3aaf90 commit48e4b8d
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