one more small dblink fix

Sorry -- missed one line that should have been removed with the last patch.
Please apply this one in addition to the other. It romoves the EXTRA_CLEAN
line since it is no longer needed.

Thanks,

Joe
Index: contrib/dblink/Makefile
===================================================================
RCS file: /opt/src/cvs/pgsql-server/contrib/dblink/Makefile,v
retrieving revision 1.6
diff -c -r1.6 Makefile
*** contrib/dblink/Makefile    3 Sep 2002 04:01:05 -0000    1.6
--- contrib/dblink/Makefile    14 Sep 2002 03:55:04 -0000
***************
*** 12,17 ****
  DATA_built = dblink.sql
  DOCS = README.dblink

- EXTRA_CLEAN = dblink.test.out dblink.test.diff
-
  include $(top_srcdir)/contrib/contrib-global.mk
--- 12,15 ----