Clean out cruft left by nonstandard test procedure.

contrib/dblink/Makefile

-# $Header: /cvsroot/pgsql/contrib/dblink/Makefile,v 1.5 2002/06/23 21:58:07 momjian Exp $
+# $Header: /cvsroot/pgsql/contrib/dblink/Makefile,v 1.6 2002/09/03 04:01:05 tgl Exp $
 
 subdir = contrib/dblink
 top_builddir = ../..
@@ -12,4 +12,6 @@ SHLIB_LINK = $(libpq)
 DATA_built = dblink.sql 
 DOCS = README.dblink
 
+EXTRA_CLEAN = dblink.test.out dblink.test.diff
+
 include $(top_srcdir)/contrib/contrib-global.mk