Thread: pgsql: Remove support of backward scan in GiST.

Log Message:
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Remove support of backward scan in GiST. Per discussion
http://archives.postgresql.org/pgsql-hackers/2008-10/msg00857.php

Modified Files:
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    pgsql/src/backend/access/gist:
        gistget.c (r1.77 -> r1.78)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistget.c?r1=1.77&r2=1.78)