Fix typo in pg_srand48 (srand48 in older branches).

">" should be ">>".  This typo results in failure to use all of the bits
of the provided seed.

This might rise to the level of a security bug if we were relying on
srand48 for any security-critical purposes, but we are not --- in fact,
it's not used at all unless the platform lacks srandom(), which is
improbable.  Even on such a platform the exposure seems minimal.

Reported privately by Andres Freund.

Branch
------
REL8_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/95e04d3a32dee0069f4b8040d002fce6f0b3154b

Modified Files
--------------
src/port/rand.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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	Subject: pgsql: Fix typo in pg_srand48 (srand48 in older branches).