Update GiST for new pg_opclass arrangement (finally a clean solution

Tom Lane <tgl@sss.pgh.pa.us>

Commit: a54075a6d6df36f4c676486b4711ccfc650bf5e2
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-08-22T18:24:26Z
Releases: 7.2.1
Update GiST for new pg_opclass arrangement (finally a clean solution
for haskeytype).  Update GiST contrib modules too.  Add linear-time split
algorithm for R-tree GiST opclass.
From Oleg Bartunov and Teodor Sigaev.

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