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.

contrib/btree_gist/btree_gist--unpackaged--1.0.sql

@@ -170,3 +170,71 @@ ALTER EXTENSION btree_gist ADD operator family gist_inet_ops using gist;
 ALTER EXTENSION btree_gist ADD operator class gist_inet_ops using gist;
 ALTER EXTENSION btree_gist ADD operator family gist_cidr_ops using gist;
 ALTER EXTENSION btree_gist ADD operator class gist_cidr_ops using gist;
+
+-- Add new-in-9.1 stuff to the operator classes.
+
+ALTER OPERATOR FAMILY gist_oid_ops USING gist ADD
+	OPERATOR	6	<> (oid, oid) ;
+
+ALTER OPERATOR FAMILY gist_int2_ops USING gist ADD
+	OPERATOR	6	<> (int2, int2) ;
+
+ALTER OPERATOR FAMILY gist_int4_ops USING gist ADD
+	OPERATOR	6	<> (int4, int4) ;
+
+ALTER OPERATOR FAMILY gist_int8_ops USING gist ADD
+	OPERATOR	6	<> (int8, int8) ;
+
+ALTER OPERATOR FAMILY gist_float4_ops USING gist ADD
+	OPERATOR	6	<> (float4, float4) ;
+
+ALTER OPERATOR FAMILY gist_float8_ops USING gist ADD
+	OPERATOR	6	<> (float8, float8) ;
+
+ALTER OPERATOR FAMILY gist_timestamp_ops USING gist ADD
+	OPERATOR	6	<> (timestamp, timestamp) ;
+
+ALTER OPERATOR FAMILY gist_timestamptz_ops USING gist ADD
+	OPERATOR	6	<> (timestamptz, timestamptz) ;
+
+ALTER OPERATOR FAMILY gist_time_ops USING gist ADD
+	OPERATOR	6	<> (time, time) ;
+
+ALTER OPERATOR FAMILY gist_timetz_ops USING gist ADD
+	OPERATOR	6	<> (timetz, timetz) ;
+
+ALTER OPERATOR FAMILY gist_date_ops USING gist ADD
+	OPERATOR	6	<> (date, date) ;
+
+ALTER OPERATOR FAMILY gist_interval_ops USING gist ADD
+	OPERATOR	6	<> (interval, interval) ;
+
+ALTER OPERATOR FAMILY gist_cash_ops USING gist ADD
+	OPERATOR	6	<> (money, money) ;
+
+ALTER OPERATOR FAMILY gist_macaddr_ops USING gist ADD
+	OPERATOR	6	<> (macaddr, macaddr) ;
+
+ALTER OPERATOR FAMILY gist_text_ops USING gist ADD
+	OPERATOR	6	<> (text, text) ;
+
+ALTER OPERATOR FAMILY gist_bpchar_ops USING gist ADD
+	OPERATOR	6	<> (bpchar, bpchar) ;
+
+ALTER OPERATOR FAMILY gist_bytea_ops USING gist ADD
+	OPERATOR	6	<> (bytea, bytea) ;
+
+ALTER OPERATOR FAMILY gist_numeric_ops USING gist ADD
+	OPERATOR	6	<> (numeric, numeric) ;
+
+ALTER OPERATOR FAMILY gist_bit_ops USING gist ADD
+	OPERATOR	6	<> (bit, bit) ;
+
+ALTER OPERATOR FAMILY gist_vbit_ops USING gist ADD
+	OPERATOR	6	<> (varbit, varbit) ;
+
+ALTER OPERATOR FAMILY gist_inet_ops USING gist ADD
+	OPERATOR	6	<>  (inet, inet) ;
+
+ALTER OPERATOR FAMILY gist_cidr_ops USING gist ADD
+	OPERATOR	6	<> (inet, inet) ;