remove gist decompress support function #657
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https://www.postgresql.org/message-id/flat/CAJEAwVELVx9gYscpE%3DBe6iJxvdW5unZ_LkcAaVNSeOwvdwtD%3DA%40mail.gmail.com
Decompress support function has become optional in gist since Postgres 11. This PR removes decompress for all gist implementation because they all are NOP in PostGIS. Also I observe 4-6% faster scan and build like mentioned in pgsql-hackers discussion.