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/pg_freespacemap/.gitignore

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

contrib/pg_freespacemap/Makefile

@@ -3,8 +3,8 @@
 MODULE_big = pg_freespacemap
 OBJS = pg_freespacemap.o
 
-DATA_built = pg_freespacemap.sql
-DATA = uninstall_pg_freespacemap.sql
+EXTENSION = pg_freespacemap
+DATA = pg_freespacemap--1.0.sql pg_freespacemap--unpackaged--1.0.sql
 
 ifdef USE_PGXS
 PG_CONFIG = pg_config

contrib/pg_freespacemap/pg_freespacemap--1.0.sql

@@ -1,8 +1,4 @@
-/* contrib/pg_freespacemap/pg_freespacemap.sql.in */
-
--- Adjust this setting to control where the objects get created.
-SET search_path = public;
-
+/* contrib/pg_freespacemap/pg_freespacemap--1.0.sql */
 
 -- Register the C function.
 CREATE OR REPLACE FUNCTION pg_freespace(regclass, bigint)

contrib/pg_freespacemap/pg_freespacemap--unpackaged--1.0.sql

@@ -0,0 +1,4 @@
+/* contrib/pg_freespacemap/pg_freespacemap--unpackaged--1.0.sql */
+
+ALTER EXTENSION pg_freespacemap ADD function pg_freespace(regclass,bigint);
+ALTER EXTENSION pg_freespacemap ADD function pg_freespace(regclass);

contrib/pg_freespacemap/pg_freespacemap.control

@@ -0,0 +1,5 @@
+# pg_freespacemap extension
+comment = 'examine the free space map (FSM)'
+default_version = '1.0'
+module_pathname = '$libdir/pg_freespacemap'
+relocatable = true

contrib/pg_freespacemap/uninstall_pg_freespacemap.sql

@@ -1,7 +0,0 @@
-/* contrib/pg_freespacemap/uninstall_pg_freespacemap.sql */
-
--- Adjust this setting to control where the objects get dropped.
-SET search_path = public;
-
-DROP FUNCTION pg_freespace(regclass, bigint);
-DROP FUNCTION pg_freespace(regclass);