Repair damage done by citext--1.1--1.2.sql.

That script is incorrect in that it sets the combine function for
max(citext) twice instead of setting the combine function for
max(citext) once and the combine functon for min(citext) once.  The
consequence is that if you install 1.0 or 1.1 and then update to 1.2,
you end up with min(citext) not having a combine function, contrary to
what was intended.  If you install 1.2 directly, you're OK.

Fix things up by defining a new 1.3 version.  Upgrading from 1.2 to
1.3 won't change anything for people who first installed the 1.2
version, but people upgrading from 1.0 or 1.1 will get the right
catalog contents once they reach 1.3.

Report and patch by David Rowley, reviewed by Andreas Karlsson.

contrib/citext/Makefile

@@ -3,8 +3,8 @@
 MODULES = citext
 
 EXTENSION = citext
-DATA = citext--1.2.sql citext--1.1--1.2.sql citext--1.0--1.1.sql \
-	citext--unpackaged--1.0.sql
+DATA = citext--1.3.sql citext--1.2--1.3.sql citext--1.1--1.2.sql \
+	citext--1.0--1.1.sql citext--unpackaged--1.0.sql
 PGFILEDESC = "citext - case-insensitive character string data type"
 
 REGRESS = citext

contrib/citext/citext--1.2--1.3.sql

+/* contrib/citext/citext--1.2--1.3.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION citext UPDATE TO '1.3'" to load this file. \quit
+
+UPDATE pg_aggregate SET aggcombinefn = 'citext_smaller'
+WHERE aggfnoid = 'min(citext)'::pg_catalog.regprocedure;

contrib/citext/citext.control

 # citext extension
 comment = 'data type for case-insensitive character strings'
-default_version = '1.2'
+default_version = '1.3'
 module_pathname = '$libdir/citext'
 relocatable = true