Hook pg_upgrade into the contrib makefile structure so it gets built

on the buildfarm.

contrib/Makefile

@@ -1,4 +1,4 @@
-# $PostgreSQL: pgsql/contrib/Makefile,v 1.90 2009/11/18 21:57:56 tgl Exp $
+# $PostgreSQL: pgsql/contrib/Makefile,v 1.91 2010/05/12 16:50:58 tgl Exp $
 
 subdir = contrib
 top_builddir = ..
@@ -31,6 +31,7 @@ SUBDIRS = \
 		pg_standby	\
 		pg_stat_statements \
 		pg_trgm		\
+		pg_upgrade	\
 		pgbench		\
 		pgcrypto	\
 		pgrowlocks	\

contrib/README

@@ -129,6 +129,10 @@ pg_trgm -
 	matching.
 	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>
 
+pg_upgrade -
+	Support for in-place upgrade between major releases of PostgreSQL
+	Bruce Momjian <bruce@momjian.us> and others
+
 pgbench -
 	TPC-B like benchmarking tool
 	by Tatsuo Ishii <ishii@sraoss.co.jp>