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/pgrowlocks/.gitignore

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

contrib/pgrowlocks/Makefile

@@ -1,15 +1,10 @@
-#-------------------------------------------------------------------------
-#
-# pgrowlocks Makefile
-#
 # contrib/pgrowlocks/Makefile
-#
-#-------------------------------------------------------------------------
 
 MODULE_big	= pgrowlocks
 OBJS		= pgrowlocks.o
-DATA_built	= pgrowlocks.sql
-DATA		= uninstall_pgrowlocks.sql
+
+EXTENSION = pgrowlocks
+DATA = pgrowlocks--1.0.sql pgrowlocks--unpackaged--1.0.sql
 
 ifdef USE_PGXS
 PG_CONFIG = pg_config

contrib/pgrowlocks/pgrowlocks--1.0.sql

@@ -1,7 +1,4 @@
-/* contrib/pgrowlocks/pgrowlocks.sql.in */
-
--- Adjust this setting to control where the objects get created.
-SET search_path = public;
+/* contrib/pgrowlocks/pgrowlocks--1.0.sql */
 
 CREATE OR REPLACE FUNCTION pgrowlocks(IN relname text,
     OUT locked_row TID,		-- row TID

contrib/pgrowlocks/pgrowlocks--unpackaged--1.0.sql

@@ -0,0 +1,3 @@
+/* contrib/pgrowlocks/pgrowlocks--unpackaged--1.0.sql */
+
+ALTER EXTENSION pgrowlocks ADD function pgrowlocks(text);

contrib/pgrowlocks/pgrowlocks.control

@@ -0,0 +1,5 @@
+# pgrowlocks extension
+comment = 'show row-level locking information'
+default_version = '1.0'
+module_pathname = '$libdir/pgrowlocks'
+relocatable = true

contrib/pgrowlocks/uninstall_pgrowlocks.sql

@@ -1,6 +0,0 @@
-/* contrib/pgrowlocks/uninstall_pgrowlocks.sql */
-
--- Adjust this setting to control where the objects get dropped.
-SET search_path = public;
-
-DROP FUNCTION pgrowlocks(text);