Fix upgrade of contrib/btree_gist from 9.0.

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

Commit: ec65a79db2a423a156cda8e862d34052d7175a86
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-02-17T21:38:04Z
Releases: 9.1.0
Fix upgrade of contrib/btree_gist from 9.0.

The initial version of the update-from-unpackaged script neglected to
include the <> operators that were added to the opclasses during 9.1.
To make this script produce the same final state as the regular install
script, use the same ALTER OPERATOR FAMILY trick as in pg_trgm.

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