Convert contrib modules to use the extension facility.

This isn't fully tested as yet, in particular I'm not sure that the
"foo--unpackaged--1.0.sql" scripts are OK.  But it's time to get some
buildfarm cycles on it.

sepgsql is not converted to an extension, mainly because it seems to
require a very nonstandard installation process.

Dimitri Fontaine and Tom Lane

contrib/lo/.gitignore

@@ -1 +0,0 @@
-/lo.sql

contrib/lo/Makefile

@@ -1,8 +1,9 @@
 # contrib/lo/Makefile
 
 MODULES = lo
-DATA_built = lo.sql
-DATA = uninstall_lo.sql
+
+EXTENSION = lo
+DATA = lo--1.0.sql lo--unpackaged--1.0.sql
 
 ifdef USE_PGXS
 PG_CONFIG = pg_config

contrib/lo/lo--1.0.sql

@@ -1,7 +1,4 @@
-/* contrib/lo/lo.sql.in */
-
--- Adjust this setting to control where the objects get created.
-SET search_path = public;
+/* contrib/lo/lo--1.0.sql */
 
 --
 --	Create the data type ... now just a domain over OID

contrib/lo/lo--unpackaged--1.0.sql

@@ -0,0 +1,5 @@
+/* contrib/lo/lo--unpackaged--1.0.sql */
+
+ALTER EXTENSION lo ADD domain lo;
+ALTER EXTENSION lo ADD function lo_oid(lo);
+ALTER EXTENSION lo ADD function lo_manage();

contrib/lo/lo.control

@@ -0,0 +1,5 @@
+# lo extension
+comment = 'Large Object maintenance'
+default_version = '1.0'
+module_pathname = '$libdir/lo'
+relocatable = true

contrib/lo/uninstall_lo.sql

@@ -1,17 +0,0 @@
-/* contrib/lo/uninstall_lo.sql */
-
--- Adjust this setting to control where the objects get dropped.
-SET search_path = public;
-
---
--- This removes the LO type
--- It's used just for development
---
-
--- drop the type and associated functions
-DROP TYPE lo CASCADE;
-
--- the trigger function has no dependency on the type, so drop separately
-DROP FUNCTION lo_manage();
-
--- the lo stuff is now removed from the system